why cant we divide a matrix

Asked by Pawan kalyan | 24th Apr, 2013, 05:14: PM

Expert Answer:

The formal definition of division is actually given in terms of multiplication. a/b is defined to mean ab', where b' is the multiplicative inverse of b. The stuff the teach you early on in school about how division means "how many times one number goes into another number" is only the intuitive interpretation of division in the real numbers, and it makes no sense in other systems.

With this idea in mind, a logical matrix division A/B would be defined as AB^-1, where B^-1 is the inverse matrix of B. However, only square matrices with nonzero determinants have inverses, so this would be a very restricted operation. Fortunately, it doesn't matter. Division is only really a relevant operation in a field, and matrices pretty much never form a field, just vector spaces and modules.

Answered by  | 25th Apr, 2013, 07:07: AM

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