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Aug
20
asked Prove $\det(A+BC)=\det(A+CB)$ if $AB=BA$
Aug
18
asked Normal transformation with eigenvalue in real and complex case
Aug
7
accepted Prove $AB=BA$ if $A^kB=BA^k$ and $A$ positive definite
Aug
6
comment Prove $AB=BA$ if $A^kB=BA^k$ and $A$ positive definite
@MoseWintner it just gives AB,BA similar
Aug
6
revised Prove $AB=BA$ if $A^kB=BA^k$ and $A$ positive definite
edited title
Aug
6
asked Prove $AB=BA$ if $A^kB=BA^k$ and $A$ positive definite
Aug
6
revised If $A$ is nipotent, how to prove that $A+A^*$ is not nilpotent?
added 5 characters in body
Aug
6
revised If $A$ is nipotent, how to prove that $A+A^*$ is not nilpotent?
added 5 characters in body
Aug
6
asked If $A$ is nipotent, how to prove that $A+A^*$ is not nilpotent?
Aug
6
revised Prove $M^{\perp}\cap V$ is invariant under $A$ if subspace $M$ of its complexification $V^{+}$ is invariant under $A^{+}$
added 2 characters in body; edited title
Aug
5
revised Prove $M^{\perp}\cap V$ is invariant under $A$ if subspace $M$ of its complexification $V^{+}$ is invariant under $A^{+}$
edited title
Aug
5
asked Prove $M^{\perp}\cap V$ is invariant under $A$ if subspace $M$ of its complexification $V^{+}$ is invariant under $A^{+}$
Aug
3
comment The projection $EF=E$ imply $M_2\subset M_1$?
What is R(i+j)?
Aug
3
comment The projection $EF=E$ imply $M_2\subset M_1$?
I don't understand your notation
Aug
3
asked The projection $EF=E$ imply $M_2\subset M_1$?
Aug
1
revised Prove for symmetric real matrix $M$,$z^TMz>0$ for real vector $z$ for real implies it's true in complex
added 1 character in body
Aug
1
asked Prove for symmetric real matrix $M$,$z^TMz>0$ for real vector $z$ for real implies it's true in complex
Jul
29
asked Prove there exists a self-adjoint transformation $C$ s.t. $CA=B$ if $A$ and $AB$ are self adjoint
Jul
29
asked Why we define the adjoint operator
Jul
23
asked Topology property of inner product and norm