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visits member for 2 years, 5 months
seen Oct 25 '13 at 23:03

Mar
18
awarded  Yearling
Apr
16
answered Find the angle at vertex $B$
Apr
9
answered Are the contours of every plane parallel to the x-z plane of a function F, circles?
Apr
9
answered Probability of rain with different probabilities
Apr
8
comment If $A$ is a symmetric matrix, show that every eigenvalue of $A$ is nonnegative if and only if $A=B^2$
There's a proof here on the second page.
Apr
8
revised Express each of the standard basis vectors as linear combination of $\alpha_1,\alpha_2,\alpha_3$
added 206 characters in body
Apr
8
answered Express each of the standard basis vectors as linear combination of $\alpha_1,\alpha_2,\alpha_3$
Apr
8
comment What do I need to know to understand Lagrange multipliers?
MIT OCW has a few good lectures on Lagrange Multipliers:ocw.mit.edu/courses/mathematics/…
Apr
7
answered If $A$ is a symmetric matrix, show that every eigenvalue of $A$ is nonnegative if and only if $A=B^2$
Apr
7
answered Square matrix multiplication when raised to a power
Apr
6
comment Finding Determinants Recursively
Thanks for pointing out my typo
Apr
6
revised Finding Determinants Recursively
typo
Apr
6
revised the change of variables formula and applications of integration
Latex formatting
Apr
6
suggested suggested edit on the change of variables formula and applications of integration
Apr
6
asked Finding Determinants Recursively
Mar
18
awarded  Yearling
Mar
11
revised Anyone could help me with this trig question
Latex formatting
Mar
11
suggested suggested edit on Anyone could help me with this trig question
Mar
11
answered Linear algebra help please
Mar
2
answered microsoft excel Excel alphabetical index