  Centrale des maths - centraledesmaths.uregina.ca  Dilemmes & doutes    « D & D »    Sujet: reconstruction   nouvelle recherche

4 articles trouvés pour ce sujet.    Page1/1            Vehicle collision 2007-07-31 Tania pose la question :If a driver falls asleep at the wheel of a newer model car and slams into the rear of a parked classic mustang (2860-3280lb) and the parked car is thrown 100 ft across the street, what would be the minimum speed required by the newer car in order to move the mustang?Penny Nom lui répond.     Two matrix problems 2005-03-30 Sue pose la question :Question 1 Suppose all matrices in the equation below are square and invertible. Solve for x . BA-1XB-1 + 2BA + In = 0 (the symbol "0" here denotes the matrix of all 0's in it) Also, A-1 or B-1 is indicating inverse and "In" = for example, A-1 times A I hope you understand the above. I have to show all the steps. Question 2 Suppose we consider the set of all 2x2 matrices along with the operations of matrix addition and multiplication. Do they form a field? Why or why not? I think the answer is no because under multiplication it is not commutative and not all square matrices are invertible. I not positive so I'd like some help.Penny Nom lui répond.     A matrix construction problem 2005-03-14 Marcelo pose la question :I want to know if is it possible to solve this problem: I have an empty NxM matrix and I know totals (sum) by rows and totals by column. Is there any algorithm to fill the matrix so that the summary of columns and rows gives the original values I have?Harley Weston lui répond.     Matrix reconstruction 2001-07-19 Guy pose la question :Is there a way to get the sums of rows, columns and diagonals of an n x n matrix to reconstruct the original matrix?Walter Whiteley and Patrick Maidorn lui répond.      Page1/1    Centrale des maths reçoit une aide financière de l’Université de Regina et de The Pacific Institute for the Mathematical Sciences.    Qui sommes-nous :: carte du site :: our english site