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**genericname****Member**- Registered: 2012-05-16
- Posts: 52

Let's say for example,

Matrices A1;A2;A3 with dimensions:

A1 = 5x10

A2 = 10x3

A3 = 3x10

Would M[2,3] be equal to (10*3*10) or (10*3)?

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**bobbym****Administrator**- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 87,238

Hi;

Okay I got the definitions of your 3 matrices.

What is M[2,3]?

You want the dimensions of A1 x A2 x A3?

**In mathematics, you don't understand things. You just get used to them.Of course that result can be rigorously obtained, but who cares?Combinatorics is Algebra and Algebra is Combinatorics.**

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**genericname****Member**- Registered: 2012-05-16
- Posts: 52

Dimensions A2 x A3. Sorry.

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**bobbym****Administrator**- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 87,238

Hi;

That would yield a 10 x 10

The number of columns of the 1st matrix must equal the number of rows of the 2nd matrix.

And the result will have the same number of rows as the 1st matrix, and the same number of columns as the 2nd matrix.

**In mathematics, you don't understand things. You just get used to them.Of course that result can be rigorously obtained, but who cares?Combinatorics is Algebra and Algebra is Combinatorics.**

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