. centre de ressources dilemmes et doutes le visage humain de mathématiques Qui sommes-nous Problème de mois activités de promotion babillard
Centrale des maths - centraledesmaths.uregina.ca
Dilemmes & doutes
« D & D »
. .
topic card  



liste de
. .
nouvelle recherche

77 articles trouvés pour ce sujet.
isomorphisme 2000-08-10
Romain Kroes pose la question :
Pour les beoins d'un ouvrage d'économie que je suis en train de terminer, pouvez-vous me dire qui est (sont) l'inventeur de l' "isomorphisme" en mathématiques (calcul tensoriel)?
Claude Tardif lui répond.
How was math created? 2019-09-03
Phu pose la question :
How was math created?
Harley Weston lui répond.
Archimedes Burning Mirror 2012-07-17
Frakeetta pose la question :
Archimedes Burning Mirror There is a story about Archimedes that he used a “burning mirror” in the shape of a paraboloid of revolution to set fire to enemy ships in the harbor. What would be the equation of the parabola that one would rotate to form the appropriate paraboloid if it were to be designed to set fire to a ship 100m from the mirror? How large would the burning mirror need to be? What is the likelihood that this story is true?
Robert Dawson lui répond.
Why is the letter Z used for the integers? 2012-06-11
ROSE pose la question :
WHY is that the acronym of integers is represented by letter Z or J?
Chris Fisher lui répond.
The difference in latitudes of two cities 2012-01-18
Renee pose la question :
Assuming that the earth is a sphere of radius 6378 kilometers, what is the difference in latitudes of two cities, one of which is 600 kilometers due north of the other?
Robert Dawson lui répond.
The development of the Pythagorean theorem 2011-04-08
Ataa pose la question :
I am doing a assignment on Pythagorean Theorem and i am stuck on the sub-question development of the Pythagorean theorem and i really need help can u give me accurate info for this because i am not finding anything!!!thanks in advance.
Yours truly

Chris Fisher lui répond.
More on millions and billions 2010-03-11
julio pose la question :
shouldn't the thousands of millions, tens of thousands of millions, and hundreds of thousands of millions be called what they are? technically they are not billions because billions come after 999,999,999,999 . It would sound better to call the numbers by their real name when economists talk about the national deficit besides mathematics is a very precise science that doesn't admit mistakes. Or am I wrong? I know that in other countries is expressed different than here. I have this question to different people and nobody has a "logical" explanation to it. " that's the way is here in the US" does not explain any thing
Penny Nom lui répond.
What is the exact value of pi? 2008-09-27
mahesh pose la question :
what is the exact value of pi.
22/7 is accurate value of pi, if not then how can i find out the exact pi value.

Harley Weston lui répond.
Jean-Charles de Borda 2008-08-29
Joanne pose la question :
I am researching Jean-Charles de Borda as a mathmatician. What was his work focused on and where can I find more information?
Penny Nom lui répond.
The perimeter of a regular polygon 2007-09-18
Ashwynn pose la question :
why does the area of regular polygons with a perimeter of 1000m increase as the number of sides increase?
Stephen La Rocque lui répond.
Does every number have a square root? 2007-09-10
Cheryl pose la question :
Does every number have a square root?
Harley Weston lui répond.
What is the origin of pi? 2007-04-30
Aastha pose la question :
from where has been tha value of "pi" derived? or what is the origin of "pi"
Penny Nom lui répond.
What is pi? 2007-03-09
Billy pose la question :
What is pi?
Jaymi Peterson and Sara Ulmer lui répond.
What value of pi did the Indians use? 2007-03-06
gigi pose la question :
What value of pi did the indians use?
Penny Nom and Sara Ulmer lui répond.
The writing of numerals 2007-02-23
Abbas pose la question :
What is the reason to write the integral such that one as 1 two as 2 similarly three as 3 and vice versa
Penny Nom lui répond.
Who invented the division symbol? 2006-12-29
Alex pose la question :
Who invented the division symbol?
Penny Nom lui répond.
The history of the meter 2006-10-23
Caitlyn pose la question :
i'm an 8th grade student and i have a lab report due and i really need to find out more about the history of the meter.
Stephen La Rocque lui répond.
History of mathematics 2006-09-06
Sharon pose la question :
i am looking for the history of math could you help
Stephen La Rocque lui répond.
The development of trigonometry 2006-08-15
Eugene pose la question :
Can you please give the exact time line of trigonometry.
Penny Nom lui répond.
How old is y = mx + b? 2006-07-05
Beckie pose la question :
I am taking intermediate algebra this summer (Math 95), and have a question for you. My instructor will award extra credit points to any of us who find out how old the formula y = mx+b is. Would you happen to know the answer?
Penny Nom lui répond.
Mayan multiplication 2006-04-16
Marca pose la question :
I'm researching the Mayans, and my advisor, Dr. McDonald, stated that you may know whether the Mayans knew how to multiply. I'm finding conflicting information on the internet, and anything you could provide would be greatly appreciated.
Chris Fisher lui répond.
Right angles 2006-01-25
AshLee pose la question :
I was recently given a challenge in my Algebra class. My teacher wanted to know about a right angle. He said he would give five bonus points to the person that could bring in information. (I know five bonus points may not seem like a lot but in this class, they are.) I looked on this site and I found out why it was called a right triangle, but my teacher want to know where did that theory come from. I was wondering too... not just because of the bonus points.
Penny Nom lui répond.
BEDMAS 2005-11-24
Judy pose la question :
My name is Judy and I am a grade 6 teacher.
We have just started our lessons on the order of operations and my students have asked me why we have BEDMAS and what is the logic to it.

Is there a reason that that we do math in this particular order?

Who invented this rule or how was it decided on and when?

Walter Whiteley lui répond.
The horizontal fraction bar 2004-05-27
Kashia pose la question :
What is the name of the bar that separates a numerator and that denominator?
Penny Nom lui répond.
Ratio and proportion 2004-04-02
Kenneth pose la question :
The terms of a ratio in a proportion are often expressed as a is to b as c is to d.

Example: 2/4 = 6/12 this proportion represents that 2 is to 4 as 6 is to 12.

What does the "a is to b as c is to d" really represent or indicate in ratios?

Claude Tardif lui répond.
Johann Muller 2004-03-14
A student pose la question :
What major contributions to spherical trigonometry did Johann Muller make?
Penny Nom lui répond.
Zero 2004-02-12
Syazwan pose la question :
can you tell me who and when the number zero was discoveredd
Penny Nom lui répond.
Order of operations 2004-01-28
John pose la question :

I am trying to find out any information concerning the development of the order of operations. for example, when (why/how) did it become the case that 2 + 3 x 5 =17, rather than 25.

any insight is appreciated. Thank you.

Penny Nom lui répond.
Polynomials 2004-01-25
Bruce pose la question :

A polynomial is defined as
Polynomial functions are functions that have this form:
f(x) = anxn + an-1xn-1 + ... + a1x + a0
The value of n must be an nonnegative integer. That is, it must be whole number; it is equal to zero or a positive integer.
The coefficients, as they are called, are an, an-1, ..., a1, a0. These are real numbers.


  1. why must n be positive?
  2. what are some historical facts about the evolution of the definition?

Harley Weston lui répond.
Aristotle 2003-11-21
John pose la question :

I would like to know how aristotle was related to math.

In all my searches I have found only philosophy etc. But not any math.

Penny Nom lui répond.
An inch and a millimeter 2003-06-21
Greg pose la question :
The conversion factor for inches to millimeters 25.4 It strikes me as very odd that it's not some infinite decimal. I could understand this if one system was derived from the other but as I understand it they were derived independently. Is the conversion 25.4 or 25.4000XXXXXXX? If it's just 25.4 then how did that happen?
Harley Weston lui répond.
The metric and Imperial systems 2003-06-08
Ashlee pose la question :
i am a year 8 student, and i am doing my Maths talent quest on the Metric and Imperial number system.

i was wondering, where did the 2 systems orginate and if possible, a little bit or information.

I also need to know the conversions of ounce, foot, mile..etc..from imperial to metric.

Penny Nom lui répond.
Why quadratic? 2003-01-21
Dan pose la question :
Why are equations of the form aX2 + bX + c =0 call quadratic? The quad indicates 4 but the power is 2.
Penny Nom lui répond.
Radians 2003-01-16
Erikson pose la question :
I am a student in the 10th grade and attending advanced math at my high school. I was assign to do a report about the unit circle and the radian. But there seems to be no information available about the history of the radian; who first found out about them, which civilizations used it if any. Well, hopefully you'll assist me in this troubling question. Thank you for your kind consideration.
Penny Nom lui répond.
What is larger than infinity? 2003-01-12
Dana pose la question :
What is larger than infinity?
Claude Tardif and Harley Weston lui répond.
Why do integers have the symbol of Z? 2002-01-11
Stephanie pose la question :
Why do integers have the symbol of Z? Natural numbers have the symbol of N, whole numbers have the symbol of W. Our professor has asked us to find out why the letter Z is represented for integers.
Penny Nom lui répond.
60 seconds in a minute 2001-10-11
Andy pose la question :
I am a fourth grade teacher. Yesterday my students asked "Why are there 60 seconds in a minute?" Which also led to 60 minutes in an hour? I have had trouble determining why the number 60? Any help would be appreciated.
Penny Nom lui répond.
Mystery mathematician 2001-10-08
A student pose la question :
Theres a mathematician that was born on October 16 1879 in England and died on October 1 1921 in England. Suffered from severe disabilities. Did poorly in his degree and settled for a pass degree. Was awarded the Allen scholarship for research in 1904. He also applied logic to Physics in papers such as On Some Points in the Foundation of Mathematical Physics (1908). Who is it?
Claude Tardif lui répond.
Standard deviation 2001-09-22
Doug pose la question :
I was wondering if anybody knows who the founder of standard deviation was?
Penny Nom lui répond.
Euclid and Pythagoras 2001-06-14
Scott pose la question :
Question 1. In about 300 BC Euclid recorded a proof of Pythagoras rule. Disscuss Euclid's contribution to developing the theroem.

Question 2.

Why was it named after Pyhagoras if he did not orginally discover it?

Chris Fisher lui répond.
Pi 2001-05-24
Mary pose la question :
Where does the term pi come from and how many digits are actually in pi?
Penny Nom lui répond.
Camille Jordan 2001-03-22
Missy pose la question :
Rick Seaman lui répond.
The "goesinta" box 2001-02-07
Bridget pose la question :
We are looking for the "proper" name of the "box" that is drawn around the dividend on a division problem:

  ___ 3)12 

It has always been a family joke to call it the "goesinta" box, but a search of several reference sources hasn't yielded an answer --

This is a question of curiosity rather than a question for homework.

Claude Tardif lui répond.
The Pythagorean Theorem 2001-01-08
Megan pose la question :
Why the Pythagorean Theorem so important in our lives and what is it's history?
Penny Nom lui répond.
Women mathematicians 2001-01-07
Kisha pose la question :
Can you please tell me names of at least five female math teachers who changed history back then?
Penny Nom lui répond.
Fibonacci 2000-12-07
A student pose la question :
Can you give me any info about Fibonacci??
Penny Nom lui répond.
Henri Leon Lebesgue 2000-11-14
Mandy pose la question :
I have a report that I have to do on Henri Leon Lebesgue for my Foundations of College Math class. I have searched for him on erols, google, yahoo and a few other search sites and I have only come up with one page that offered some information. I was wondering if anyone knew anything about him, or a web page that I could get some info.
Harley Weston lui répond.
Numerator and denominator 2000-06-18
Maureen Beard pose la question :
What is the origin of the terms numerator and denominater?
Penny Nom lui répond.
Volume of a sphere 2000-05-21
Kevin Partridge pose la question :
Does anyone have a way to physically demonstrate how to explain the volume formula for a sphere? Or perhaps how to derive the formula without calculus?
Harley Weston lui répond.
Mary Fairfax Greig Somerville 2000-05-03
Joshua Garrett pose la question :
I'm giving a report in class on her life. Could i recieve some sort of information about her. thank you
Claude Tardif lui répond.
2^32 + 1 2000-04-08
Un Etudiant pose la question :
232 +1 can be divided by 641 , why?
Claude Tradif lui répond.
History of a meter 2000-04-07
Jarod Fischer pose la question :
The length of a meter has been determined in three different ways. The first and original way was determined in 1798. The second way was determined in 1960. The third and current way was determined in 1983. What were the three ways and why were the first two abandoned?
Harley Weston lui répond.
The side length ratios of some triangles 2000-04-04
Alexis Lockwood pose la question :
I am doing a project for my Math 30B class regarding the side length ratios of 45-45-90 degree and 30-60-90 degree triangles. I would really appreciate any assistance in answering the following questions, or even direction to an appropriate web site or resource on the matter.
Harley Weston lui répond.
Pi 2000-02-22
Shelley Collier pose la question :
Numbers that can be written in the form p/q where p and q are integers, (q not 0), are known as rational numbers. What you are missing is that p and q must be integers. The fact that Pi is irrational means that you can't have a circle with both the circumference and diameter being integers. In fact you can't even have the circumference and diameter both rational since the quotient of two rationals is again a rational.
Claude Tardif and Penny Nom lui répond.
Why counterclockwise? 2000-02-21
Drew pose la question :
Why do the numbers of quadrants in a graph increase in a counter clockwise pattern? Why aren't they numbered increasingly in a clockwise pattern?
Chris Fisher lui répond.
A 16th century mathematician 2000-02-04
Danielle Dombrowski pose la question :
My name is Danielle Dombrowski, I am in the 7th grade and my teacher gave us a riddle to figure out which mathemtician we would have to do a report on. The only problem is that I don't know what the answer is. Can you help? The riddle is

"This 16th century mathematician, having predicted the day of his death, took poison to make sure it came true. Who is it?"

Penny Nom lui répond.
zero 2000-01-01
Jason pose la question :
What civilization first used zero?
Penny Nom lui répond.
Comma as decimal separator 1999-12-18
Franck Menuge pose la question :
Could somebody tell me the origin of the use of a 'comma' as a decimal separator and of a 'dot' for thousands in the French numeric system, ex.1.234,56 Is it only used in France or in other european coutries? Why is it different in the UK?
Patrick Maidorn and Penny Nom lui répond.
Ben's observation 1999-10-28
Emily Nghiem and Ben Rose pose la question :
As a teacher at a school called Educere in Houston, I have a ninth-grade student who discovered the following shortcut last year as an eight-grader. What he noticed is that given any two consecutive integers (or n and n+1 for any rational number greater than or equal to 2), the difference between their squares was equal to the sum of the two numbers.

Chris Fisher and Penny Nom lui répond.
Women in Trig 1999-10-11
Sandra Mills pose la question :
I am looking for some information about women who have contributed to the discipline of trigonometry. In addition to this I have been asked to choose a subject pertaining to Roman times for my Roman and American Lit class. I wanted to do a project and presentation related to mathematics, but could use some suggestions-- maybe how mathematics were applied as in engineering and the structure of the Roman buildings. Could you please provide some information about the history of mathematics and it's applications in Roman times. I am also open to any other suggestions for topics.
Chris Fisher lui répond.
Trigonometry history 1999-09-25
Nikki pose la question :
What is trigonmetry ? Who invented it ? What is it's purpose ? And anything else that you can tell me that is related to Trigometry.
Chris Fisher lui répond.
Help with three mathematicans! 1999-09-14
Ashley Tacheira pose la question :
I am a sophomore in high school and have been assigned a research paper on over thirty mathematicians. I was able to find information on all but three. I need to know the birth and death dates and major contributions of these three mathematicians. Any suggestions on where to look would be appreciated. George Stigler, T.C. Koopmans and Thomas Guthrie are the three that I cannot seem to find.
Chris Fisher lui répond.
Degrees and triangles 1999-09-09
Sandra Mills pose la question :
Are there any triangles which are not 180 degrees?

I am also in need of information on the history of degree measure for an angle.
Walter Whiteley lui répond.

Infinity Symbol 1999-07-13
Mark E. Kelly pose la question :
There is a symbol that looks like a sideways 8 that is used to represent infinity. Does it have a name?
Doug Farenick and Penny Nom lui répond.
y=mx+b 1999-04-15
Selena Royle pose la question :
When solving a problem on slopes,and in the formula y=mx+b what do the M and B stand for? Why M and B?
Penny Nom lui répond.
Trigonometry history 1998-05-26
Joeseph Huckler pose la question :
Can you please tell me some history of the trigonometric ratio Tangent? who discovered it? when was it discovered and some other useful info...
Penny Nom lui répond.
The origin of angles 1998-02-24
Marc Poulin pose la question :
I'm currently teaching angles to students in grade 10 and I've been asked what's the origin of the terms degrees, radians and gradians.

I know that the radians come from the sexagesimal numerical system of the Babylonians but my kids wanted to know dates and persons who would have brought these terms first.
Harley Weston lui répond.

Tangrams 1998-02-24
Allison pose la question :
Do you know the story behind the tangram? I know that it is a Chinese puzzle about 200 years old. If there is a story about its creation, I would love to share it with my 7th graders. Thanks.
Diane Hanson and Penny Nom lui répond.
Square Root History 1997-08-29
Carlos Montecel S. pose la question :
I need find information over the "Square Root History", Could you help me?
Harley Weston lui répond.
The Division Bracket. 1997-04-09
Judy Riley pose la question :
A fellow teacher recently asked if I remembered the exact word for a division bracket (not the symbol with dots, the horizontal line in a fraction, or a solidus). I couldn't. Can you help?
Walter Whiteley and Harley Weston lui répond.
Why QUADratic? 1997-03-19
Paula Miller pose la question :
A student today asked me why a quadratic, with highest power of degree 2, was called a QUADratic. We're awaiting the answer with baited breath! :)
Chris Fisher and Walter Whiteley lui répond.
A Presidential Proof 1997-03-18
Greg Smith pose la question :
Which US president developed a proof for the Pythagorean Theorem?

Where can a copy of the proof be located?
Chris Fisher and Harley Weston lui répond.

The Real Pythagoras 1997-03-16
Michael Gaskin pose la question :
I am wondering if you have any information about Pythagoras and his accounts in math.
Chris Fisher lui répond.
Roots of a Polynomial 1996-12-06
Paula Miller pose la question :
Why is the solution called a "root"? Why not just the "x-intercepts"?
Chris Fisher and Harley Weston lui répond.
Trigonometry 1996-11-12
Evans pose la question :
Any idea who came up with some or most of the ideas involved in trigonometry?
Chris Fisher lui répond.
Could you tell me the name for the bar in a division problem? 1996-10-21
Linda pose la question :
Could you tell me the name for the bar in a division problem. Not the line with dots on either side but the line that divides the two numbers? My name is Linda. I am asking for my niece who is in 8th grade.
Chris Fisher lui répond.
Why is a circle divided into 360 degrees? 1996-09-30
Kurtis Kredo pose la question :
I was recently wondering why a circle has been divided in to 360 degrees. When I asked my physics teacher he could not think of an answer. His guess is that it probably has to do with people long ago using the base 6 number system. I have a small inkling that it has to do with easy conversion or usage with radians or grads.
Chris Fisher lui répond.



Centrale des maths reçoit une aide financière de l’Université de Regina et de The Pacific Institute for the Mathematical Sciences.



accueil centre de ressources accueil Société mathématique du Canada l'Université de Regina PIMS