user222141

@ACuriousMind In this case assuming A and B are both square, nxn

@ACuriousMind But is it possible to augment nxn matrix A with another nxn matrix B and then row-reduce it to find M that solves AM = B like how AA^(-1) = I_n?

one inverse given by AR^(-1) and one given by L^(-1)A?

@ACuriousMind What do you mean exactly?

You can find the inverse of an nxn matrix by augmenting with identity of R^n and row-reducing, but what about non-square matrices? A*M = B where all are nxn, can I row-reduce [A | M]?

can i ask a linear algebra question in here?

@Abcd what are you trying to do

just not really sure what makes the most sense

So I am looking for some way to quickly get back up to speed and pick up where i left off

@Blue I'm 32 -- last time I did physics was in high school, about 2004 2005, did newtonian stuff in physics I and then physics II was more... magnetism, ohms law, stuff like that IIRC. Got an 800 on SAT 2 Physics with some supplemental memorization from guides and whatnot though I didn't quite understand it. Was always good at the subject but just never pursued it or anything and most of it has probably fallen out of my head by now.

@Blue Well I mean let's say one is going for a physics degree -- what sorts of topics do they normally cover? What might one consider to be a sufficient base?

somewhat of a wide net

@Blue I guess just a better understanding of physics as it might apply to electronics, getting better at newtonian physics, better at quantum physics and relativity just to better understand the universe... just a wide variety of topics

I'm good at problem-solving in general, just lacking in the formal stuff

I would absolutely love to go back to school and stuff my face with math, computer science, physics, etc, but it's not a realistic possibility for me

@Blue No, not a student anymore

@EmilioPisanty If it's any consolation, the constant crackpottery is what led me to make that question on the site... I got tired of the crap explanations that one sees over and over and over again

@PM2Ring Could probably use some work on both, as I never did formal classes in either

what I mean is how realistic is it to try to self-educate in physics without having formal training or classes or professors etc, just reading books and such

vague how?

what is the general consensus on self-teaching physics? impractical?

hey thanks again for the great answer