MichaelS
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 Nov8 awarded Famous Question Sep14 awarded Popular Question Sep2 awarded Famous Question Jul2 awarded Curious May2 awarded Popular Question Sep28 awarded Notable Question Apr19 awarded Popular Question Feb4 awarded Notable Question Aug2 awarded Yearling Jul30 comment What is the correct way to solve $|2K^3-2K^4|$ determinant? Of course.. Totally forgot about $I-K$. Thanks! Jul30 revised What is the correct way to solve $|2K^3-2K^4|$ determinant? deleted 30 characters in body Jul30 comment What is the correct way to solve $|2K^3-2K^4|$ determinant? Why couldn't we do the same trick without knowing how K is build? We know K is invertible ($det(K) \neq 0$) and we know that its size is $3\times 3$. Isn't it enough? Jul30 revised What is the correct way to solve $|2K^3-2K^4|$ determinant? pointing out the mistake Jul30 accepted What is the correct way to solve $|2K^3-2K^4|$ determinant? Jul30 revised What is the correct way to solve $|2K^3-2K^4|$ determinant? Added the matrix K Jul30 comment What is the correct way to solve $|2K^3-2K^4|$ determinant? @GerryMyerson: In which specific cases it does equal? Jul30 asked What is the correct way to solve $|2K^3-2K^4|$ determinant? Jun27 awarded Popular Question May31 accepted How to prove that the union of two subspaces must be subsets of each other? May31 revised How to prove that the union of two subspaces must be subsets of each other? edited title