Recent content by Appleton2

@graphking your English is fine, it's my limited understanding of maths that's the problem

Thanks for your responses. It took me a while to decipher your notation. (@graphking, I think it will take me another week to decipher your comment, thank you) I pasted the question from the textbook so I think it is accurately reproduced here. The book is "An introduction to linear algebra" by...

Textbook answer: "If P1P2 = P2P1 then S is contained in T or T is contained in S." My query: If P1 = \begin{pmatrix} 1 & 0 & 0 \\ 0 & 0 & 0 \\ 0 & 0 & 0 \\ \end{pmatrix}and P2 =\begin{pmatrix} 0 & 0 & 0 \\ 0 & 1 & 0 \\ 0 & 0 & 0 \\ \end{pmatrix} as far as I...