Entering matrices

A matrix is represented by a list of lists, all having the same size.

[[1,2,3],[4,5,6]]

⎡
⎢
⎣

1	2	3
4	5	6

⎤
⎥
⎦

You can give a matrix a name with assignment.

A:=[[1,2,6],[3,4,8],[1,0,1]]

⎡
⎢
⎢
⎣

⎤
⎥
⎥
⎦