I got carried away updating this one too. ;) I wasn't happy with the way I organized that answer, so I tried restructuring and explaining more along the way.
I have been following some tutorials on how Matrix maths works, with adding, dividing, scaling, etc, but I am struggling to understand how the 4x4 matrix represents an object's position in space.
There are 16 elements in the array but to my knowledge you only need to use 7 of them? (I am most li...
This is possible using the HTML extension
$$\require{HTML} \style{display: inline-block; transform: rotate(45deg)}{\Box}$$
$$\require{HTML}\style{display: inline-block; transform: rotate(45deg)}{\Box}$$
Well, here's something that doesn't work: I thought maybe you could replicate the look of a rotated vector bracket by stringing together the characters "┌─┐" and "└─┘". But when I tried to use them in mathjax, their horizontal alignment changes: