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15h
comment Dealing with Fatigue
This question appears to be off-topic because it is not about math
Jun
30
comment In Group theory proofs what is meant by “well defined”
What is the object $\phi$ about which you could ask the question "is this well-defined"? If it is a function, you are begging the question. If it is a relation, then notation like $\phi(g)$ doesn't seem to make sense. So maybe it is something else -- could you clarify what kind of object your definition of well-definedness applies to?
Jun
25
reviewed Leave Open Prove that if $A - A^2 = I$ then $A$ has no real eigenvalues
Jun
25
reviewed Close Quick check on function composition notation
Jun
22
revised Showing the following rings are isomorphic
fix typo in title
Jun
21
reviewed Approve suggested edit on How do you integrate the reciprocal of square root of cosine?
Jun
17
reviewed Approve suggested edit on Linear algebra: determining if something is an inner product space
Jun
14
comment Happily Married
en.wikipedia.org/wiki/Hall%27s_marriage_theorem
Jun
14
comment What are the formulas for the number of vertices, edges, faces, cells, 4-faces, …, $n$-faces, of convex regular polytopes in $n \geq 5$ dimensions?
en.wikipedia.org/wiki/Hypercube, en.wikipedia.org/wiki/Simplex, en.wikipedia.org/wiki/Orthoplex answer all your questions.
Jun
14
reviewed Approve suggested edit on Minimal polynomial of diagonalizable matrix
Jun
14
comment Complete induction - is my proof valid?
It's the right idea, but not quite expressed correctly: what are $c,d$ supposed to be when first introduced? You should say that if $n+1$ is prime you're done, and if not you can factor it as $n+1=cd$ with $c,d<n+1$. Then you can apply the inductive hypothesis to $c$ and $d$.
Jun
13
reviewed Reject suggested edit on Markov/Chebyshev's inequality Problems
Jun
12
reviewed Approve suggested edit on Prove by induction that $(n+1)^2 + (n+2)^2 + … + (2n)^2 = \frac{n(2n+1)(7n+1)}{6}$
Jun
12
reviewed Approve suggested edit on Double integral compute
Jun
11
reviewed Approve suggested edit on Probability question (simple)
Jun
9
reviewed Reject suggested edit on Changing the product of $V$ a $K$-space.
Jun
7
reviewed Approve suggested edit on Prove that this space is not Banach
Jun
5
reviewed Approve suggested edit on Maxmizing full workforce and minimizing downtime
Jun
2
awarded  Electorate
May
30
reviewed Approve suggested edit on if A diagonalizable then show that $a=0$