matrix, vector, limits

[jmyhcore]

using ur calque every day but sometimes i need some things like matrix or derivative but there are no such things so im requesting it.
got some idea how to do matrix, use such counstruction like

A={
i, j, k ...
a, b, c ...
x, y, z ...
}
and fucs like det(A) or pow-1(A) would be also usefull for this

[lolbinarycat]

I beleive you can use A=[i,j,k;a,b,c;x,y,z] for matricies