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"The scientist is not a person who gives the right answers, he is one who asks the right questions."

Claude Levi-Strauss

"It is not the answer that enlightens, but the question."

Decouvertes

"Millions saw the apple fall, but Newton was the one who asked why."

Bernard Baruch

"Ask the right questions. The fastest way to change the answers you receive."

Lee J. Colan

"Questions focus our thinking. Ask empowering questions like: What's good about this? What's not perfect about it yet? What am I going to do next time? How can I do this and have fun doing it?"

Charles Connolly


8h
asked The quartenion group is a Dedekind one
12h
accepted Properties of divisibility
1d
comment Properties of divisibility
Interesting, thanks bill
1d
asked Properties of divisibility
2d
comment Books in spectral theory for finite dimensional spaces
@EricO.Korman Spectral theory for finite dimensional spaces is just the spectral theorem? what is spectral theory for finite dimensional spaces exactly?
2d
revised Books in spectral theory for finite dimensional spaces
some improvements
Apr
17
comment Help with this easy lemma of linear algebra
Why $u_i^TA^Tu_j=u_i^T\sum_{k=1}^na^T_{kj}u_k$?
Apr
17
comment Help with this easy lemma of linear algebra
Thanks for the remark :)
Apr
17
comment Help with this easy lemma of linear algebra
It's true, thank you!
Apr
17
comment Help with this easy lemma of linear algebra
@Jack sorry, is it ok now?
Apr
17
revised Help with this easy lemma of linear algebra
edited body
Apr
17
comment Help with this easy lemma of linear algebra
$\langle t(u_i),u_j\rangle=(Au_i)^Tu_j$
Apr
17
comment Help with this easy lemma of linear algebra
The lemma is supposed to be proved using general properties of inner products.
Apr
17
comment Help with this easy lemma of linear algebra
Your solution seems fine but to prove the lemma you are using a particular kind of inner product.
Apr
17
comment Why is the Det(a)=0 not a subspace?
did you mean subspace of a particular group?
Apr
17
asked Help with this easy lemma of linear algebra
Apr
17
comment Are these theorems the same?
thank you for your answer!
Apr
17
asked Are these theorems the same?
Apr
17
accepted How do I prove the adjoint matrix is the adjoint of the operator
Apr
17
comment How do I prove the adjoint matrix is the adjoint of the operator
thank you very much, that's exactly I was looking for