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The Maxima on-line user's manual

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Ident

Function: ident (<n>) Returns an <n> by <n> identity matrix.

n : matrix ([a[11], a[12]], [a[21], a[22]]);
p_n : determinant (x * ident(2) - n), expand;
at (x . x - a[22]*x - a[11]*x, [x = n]);

There are also some inexact matches for ident. Try ?? ident to see them.

(%o1)                                true
(%i2) 

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