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## Main Question or Discussion Point

So, I am attempting to learn linear algebra on my own and I am using Sharipov's "Linear Algebra and Multidimensional Geometry" since mathwonk is always ranting and ravong about it.

So far, I hate it. Clearly I am not a mathematician at heart.

I thought I could periodically post questions in this thread (instead of starting a new one every time). My questions might seem dumb to some of you, but take it easy on me:shy:.

So since the edit button only works for 30 minutes now (lame), when I ask a new question, I will head it like this: NEW QUESTION: that way it will be easy to spot my latest entry.

Hopefully this works out, but more like is that people will just get annoyed with me. So here we go

NEW QUESTION What is this all about?

I mean if the set [itex]f^{-1}(y)[/itex] is just X, why do we need a name for this? Can someone tell me what the total preimage is in laymen's terms?

Thanks!

So far, I hate it. Clearly I am not a mathematician at heart.

I thought I could periodically post questions in this thread (instead of starting a new one every time). My questions might seem dumb to some of you, but take it easy on me:shy:.

So since the edit button only works for 30 minutes now (lame), when I ask a new question, I will head it like this: NEW QUESTION: that way it will be easy to spot my latest entry.

Hopefully this works out, but more like is that people will just get annoyed with me. So here we go

NEW QUESTION What is this all about?

I mean if the set [itex]f^{-1}(y)[/itex] is just X, why do we need a name for this? Can someone tell me what the total preimage is in laymen's terms?

Thanks!