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Graduate student trying to learn something.


14m
revised matrix transpose * itself = identity
added 32 characters in body
20m
answered matrix transpose * itself = identity
3h
reviewed Approve suggested edit on Is there a name for the function $g(z)=\frac{1-e^{-z}}{z}$?
3h
comment Why the square of ideal in Lie algebra is also ideal?
You might as well have just posted that as an answer.
3h
reviewed Approve suggested edit on Studying maths for physicists
4h
reviewed Approve suggested edit on Math for Future Value of Growing Annuity
4h
comment Lefschetz duality for non-compact relative manifolds
Well I don't have a complete answer but I think I can at least get a statement sufficient to prove the Lefschetz Hyperplane Theorem as in Milnor. Is this of interest to you or do you only care about the full result?
12h
reviewed Approve suggested edit on What is Binary Operation — is division a binary operation?
1d
answered Prove that a number is prime iff the factorial of its predecessor is the predecessor of one of its multiples.
1d
reviewed Reject suggested edit on Having trouble grasping the class equation as an explanation as to why a conjugate class's order divides the order of a group.
1d
reviewed Approve suggested edit on Does the sequence $\cfrac{n!}{\pi^n}$ converge or diverge and why?
2d
comment Lefschetz duality for non-compact relative manifolds
I think applying the universal coefficient to both sides gives what we want if coefficients are over a field. But I don't know about where coefficients are in $\mathbb{Z}$ or an arbitrary abelian group.
2d
reviewed Approve suggested edit on Polar Equation to Rectangular?
2d
reviewed Approve suggested edit on Recurrance Relation
2d
reviewed Approve suggested edit on Continuous Joint Probability Density and proportions
2d
comment Concept for an “Order” of Exponents
There is a notion called graded ring. You might want to read about it. What you are calling "order" is called "degree". en.wikipedia.org/wiki/Graded_ring
2d
revised Can an entire, non-constant function map $\mathbb{C}$ to a proper subset of $\mathbb{C}$?
edited title
2d
comment Can an entire, non-constant function map $\mathbb{C}$ to a proper subset of $\mathbb{C}$?
Think about $e^z$
2d
comment Construct a sequence with certain property
Enumerate the rationals.
2d
comment Lefschetz duality for non-compact relative manifolds
Ah, the bar is Alexander cohomology.