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I just have a question relative to matrices, mostly. Is the reason there are 4 values in a matrix because there are (at least in basic terms) 3 dimensions of space and one of time?

Like it seems kind of obvious, but for some weird reason in school they never state it explicitly in those terms.

Also, do matrices have any applications outside of space and time?

For future reference, can someone also please let me know if I've posted this in the right section, and if it's ok to ask questions like this, or should I be Googling/consulting a textbook/inferring...