Syntax reference
* + - / ^ with scalars and named objects
(B^4, A^-1, 2A + B), plus det(), inv(),
trans(), rref(), eig(). Implicit multiplication works:
2A, A(B+B).
Inline matrices work anywhere: [1 2] is a row, [1; 2] a column,
[1 2; 3 4] a 2×2 — ; separates rows.