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location New York, NY
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seen Dec 17 at 4:26

Mar
26
revised What kind of a mean value is this?
deleted 2 characters in body; edited tags
Mar
26
comment How to show a subset doesn't span a space?
This is an example of something on the span of the first set that is not on the span of the second set. Thus, the second span must be included in the first but the first is larger
Mar
26
answered love in an elevator
Mar
26
comment Find a change in variable that will reduce the quadratic form to a sum of squares
after you are done with arithmetic you end up with $(...)^2 + (***)^2$ so change variables to have $a = ...$ and $b = ***$ and you get $a^2 + b^2$
Mar
26
answered How to show a subset doesn't span a space?
Mar
26
comment Find a change in variable that will reduce the quadratic form to a sum of squares
Yes, rename $\left(x_1,x_2,x_3\right) \to (x,y,z)$ for convenience, then add and subtract $y^2$ and then factor out the $-$ in front of the $y,z$ terms.
Mar
26
revised matrix exponential limit
added 8 characters in body; edited tags
Mar
26
revised Implicit differentiation at a given point
added 114 characters in body
Mar
26
answered Find a change in variable that will reduce the quadratic form to a sum of squares
Mar
26
reviewed Approve Is this set linearly independent?
Mar
26
answered Is this set linearly independent?
Mar
25
comment Is determinant of matrix multiplied its transpose always positive?
@Pouya just like a square matrix can have complex eigenvalues, the rectangular matrix can have complex singular values, which would make the final result task but negative
Mar
25
answered Is determinant of matrix multiplied its transpose always positive?
Mar
25
comment Is determinant of matrix multiplied its transpose always positive?
@nam Yes, for square matrices this holds. For rectangular, you have to use similar value decomposition
Mar
25
comment Is determinant of matrix multiplied its transpose always positive?
Well, $\det(A)$ is not exactly defined for non-square $A$, and here $A$ is definitely rectangular, you cannot assume $m \neq n$
Mar
25
revised What speed can he drive?
edited tags
Mar
25
comment What speed can he drive?
Any thoughts of your own?
Mar
25
answered Degeneracy number of a ring graph
Mar
25
answered Question Regarding Telescopic Sums
Mar
25
revised L'Hospital's rule problem
added 20 characters in body; edited title