Book
Linear Algebra
Author
Gilbert Strang
Edition
a=matrix([[0,1,0],[0,0,1],[1,0,0]]) a.transpose()==a.inverse() /*returns boolean true checkn if a is orthogonal*/ var('t') t=a*a*a /*cube of a*/ t t.inverse()==t.transpose() /* returns boolean true if a^3 is orthogonal*/
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