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  • 0 posts edited
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  • 16 votes cast
Nov
13
asked How to show that Roy's identity holds in the case of a monotonic increasing transformation?
Oct
30
comment Given $AX = XD$, where $D$ is a diagonal matrix and $A$ is idempotent, is $D$ idempotent as well?
yup, i got the answer i was looking for, thanks!
Oct
30
accepted Given $AX = XD$, where $D$ is a diagonal matrix and $A$ is idempotent, is $D$ idempotent as well?
Oct
30
accepted When is a positive semi-definite matrix A positive definite?
Oct
30
comment Given $AX = XD$, where $D$ is a diagonal matrix and $A$ is idempotent, is $D$ idempotent as well?
no it's not hw, just something i was wondering about
Oct
29
asked Given $AX = XD$, where $D$ is a diagonal matrix and $A$ is idempotent, is $D$ idempotent as well?
Oct
12
asked When is a positive semi-definite matrix A positive definite?
Jun
6
accepted Can a function be homothetic if it's not homogeneous?
May
26
asked Can a function be homothetic if it's not homogeneous?
Apr
13
accepted What's the opposite of a cross product?
Apr
12
asked What's the opposite of a cross product?
Apr
9
awarded  Supporter
Apr
9
comment Payoffs question
I agree that the question is unrealistic as well. Thanks for your answer.
Apr
9
accepted Payoffs question
Apr
1
comment Payoffs question
Strangely, the answer given by my professor is f= 0.75 while I thought that the answer should be f = 0 like all your answers suggested. I'm gonna think it over again.
Apr
1
asked Payoffs question
Mar
29
awarded  Autobiographer
Mar
29
awarded  Citizen Patrol
Mar
25
accepted How is the column space of a matrix A orthogonal to its nullspace?
Mar
25
asked How is the column space of a matrix A orthogonal to its nullspace?