. 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

9 articles trouvés pour ce sujet.
Is this operation associative? 2014-01-14
patrick pose la question :
Associative test: Can you explain the following to me?

Is the following operation associative?: x*y=x+y+1
1) x*(y*z)=x*(y+z+1)=x+(y+z+1)+1=x+y+z+2
2) (x*y)*z=(x+y+1)*z=(x+y+1)+z+1=x+y+z+2

The answer is yes as 1) = 2)

My specific questions are:
1) How x*(y*z)=x*(y+z+1)=x+(y+z+1)+1 ?
2) How (x+y+1)*z=(x+y+1)+z+1?

Thank you!!

Penny Nom lui répond.
An associative binary operation 2008-09-08
Skye pose la question :
Suppose that * is an associative binary operation on a set S. Show that the set H={a E S such that a*x=x*a for all x E S} is closed under *. (We think of H as consisting of all elements of S that commute with every element in S.) Thanks!
Harley Weston lui répond.
Is this operation associative? 2008-09-06
Francesca pose la question :
Determine whether the binary operation * defined is commutative and whether * is associative * defined on Z by a*b = a-b\ I understand how to figure out if it's commutative, but I thought for a binary operation to be associative, it had to have at least three elements, so I don't know how to tell if this associative or not.
Penny Nom and Victoria West lui répond.
Associative or commutative? 2007-08-24
Terry pose la question :
5*(7*2)=(7*5)*2 Is this associative property or commutative ??? Both?
Penny Nom lui répond.
A binary operation 2007-07-31
sofia pose la question :
Prove that if * is associative and commutative binary operation on a set S, then (a*b)*(c*d) = [(d*c)*a]*b

for all a,b,c,d element in S. Assume the associative Law only for triples as in the definition that is, assume only (x*y)*z = x*(y*z) for all x,y,z element in S.

Penny Nom lui répond.
Binary operations 2007-07-30
jim pose la question :
prove or disprove:

Every binary operation on a set consisting of a single element is both commutative and associative.

Penny Nom lui répond.
Fill in the blanks 2006-10-04
Justin pose la question :
1. To find out about how much, you can-------------
2. The --------- ---------states that the sum is the same no matter who you group the addends.

Stephen La Rocque lui répond.
Addends can be grouped differently but the sum does not change 2002-09-03
Jodia pose la question :
I have been searching the web for over an hour & a half now for the answer to the following question:

The _____ states that addends can be grouped differently but the sum does not change.

Penny Nom lui répond.
Definitions 1997-09-08
SohoGirl13 pose la question :
I am an 8th grader. my e-mail address is SohoGirl13@aol.com. I have a question: what are the associative, communitive, and distributive properties?
Harley Weston 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