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Jul
25
comment How to solve linear system of form $(A \otimes B + C^{T}C)x = b$ when $A \otimes B$ is too large to compute?
Are the diagonal blocks in $C^TC$ the same? Also, is $b \neq 0$?
Jul
25
comment What is the vector equation of a straight line?
I am not sure what you mean. Could you explain?
Jul
25
comment What is the vector equation of a straight line?
They are different. The link in the answer explains what a parametric equation is.
Jul
25
comment What is the vector equation of a straight line?
@BROY, I have added some vector notation. I didn't use them because it was obvious from the context which was which (I usually don't use $\vec {}$ because it is is clunky, furthermore you didn't use them in your original post). I am not sure what you mean by a vector equation, could you elaborate?
Jul
25
revised What is the vector equation of a straight line?
added 84 characters in body
Jul
25
answered What is the vector equation of a straight line?
Jul
24
comment How to solve linear system of form $(A \otimes B + C^{T}C)x = b$ when $A \otimes B$ is too large to compute?
Are the sizes of the diagonal blocks in $C^TC$ the same size as $B$?
Jul
19
comment Is there a function $f$ such that $f(x) =1$ if $x=p/q$ and $f(x)=0$ otherwise?
Your $\delta$ is not a Dirac delta.
Jul
19
comment Is there a function $f$ such that $f(x) =1$ if $x=p/q$ and $f(x)=0$ otherwise?
@DavidC.Ullrich, sure, that is not impossible. Neither is it impossible that the Kronecker delta is actually what he wants (and currently, this is how the question is worded).
Jul
19
reviewed Leave Open Maximum sum of cathetii (shorter arms of triangle ) with hypotenuse length =1
Jul
19
reviewed Close A question about the matlab error “Subscript indices must either be real positive integers or logicals”
Jul
19
reviewed Leave Open Critical Point Question
Jul
19
comment Is there a function $f$ such that $f(x) =1$ if $x=p/q$ and $f(x)=0$ otherwise?
If you want a name for the function $f : \mathbb Q \to \mathbb Q$ it is the Kronecker delta $\delta(\frac{p}{q} - x)$, see en.wikipedia.org/wiki/Kronecker_delta.
Jul
19
comment Is there a function $f$ such that $f(x) =1$ if $x=p/q$ and $f(x)=0$ otherwise?
Yes, there is such a function. You have just defined it.
Jul
15
awarded  Enlightened
Jul
15
awarded  Nice Answer
Jul
9
answered rank 1 constraint
Jul
4
revised Calculating the rank of a Boolean matrix and Boolean matrix factorization
added 820 characters in body
Jul
2
reviewed Leave Open This random variable converges in distribution?
Jul
1
answered Calculating the rank of a Boolean matrix and Boolean matrix factorization