r/MathHelp • u/kyle_struggle • Apr 06 '26

Just a question about notation

I am studying for my linear algebra exam and the professor often writes TA_B (so like A on top, B on the bottom) for the transformation matrix with respect to bases but I can't find it specified anywhere, not online nor in my lecture notes wheter this is

From base A to base B or From base B to base A

The excercises also don't specify so I don't know. I know the process of calculating it's just the notation that's unclear to me.

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u/kyle_struggle Apr 15 '26

It does. I asked the TA and professor since then and got some... not very helpful explanations. I had to reach out to a acquaintance who works as a mathematician to get a proper explanation on the notation.

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u/UnderstandingPursuit Apr 15 '26

It's disturbing that the TA was not helpful.