164,418 reputation
15220445
bio website boolesrings.org/asafk
location Israel
age 29
visits member for 4 years, 2 months
seen 1 hour ago

Ph.D. student in the Hebrew University of Jerusalem.

Set theorist to-be.


5h
reviewed Close Let $A$ a finite ring. Prove that $A$ is a field, or $A$ has zero divisors.
6h
revised How to express $\oplus$ with only $\neg$ and $\implies$?
added 28 characters in body
6h
reviewed No Action Needed Sum of Squares of Harmonic Numbers
9h
revised Finding $\int_{-\infty}^\infty |f\ast f'|^2(x)\,dx$ using Plancherel’s theorem
edited tags
9h
revised When do Leibniz-like rules lead to unique linear operators
edited tags
9h
comment Over ZF, does “every Hilbert space have a basis” imply AC?
Considering the fact that this doesn't seem to appear in the literature, I'd suggest that this is still open. My guess is that it's in fact equivalent, and that some variant of Blass' original proof will do the trick.
14h
revised Characterization of Discrete Sets in R
added 260 characters in body
14h
comment Characterization of Discrete Sets in R
Pick any convergent sequence without its limit point, then the set of points left is discrete. But since the sequence is convergent it is certainly bounded.
14h
answered Characterization of Discrete Sets in R
14h
revised If all mappings $f: A\to B$ are many-to-one, does there exist surjective $g: A\to B$?
added 1816 characters in body
15h
reviewed No Action Needed Covariance of m-fold integrated Wiener process
15h
reviewed No Action Needed Equivalence classes of (2,3)-pairs in PSL(2,q)
15h
reviewed Reviewed Enclosing land by fence pieces
16h
reviewed Leave Open Proof for formula for sum of sequence $1+2+3+\ldots+n$?
16h
reviewed Close I do not know how to slove it
16h
reviewed Close How to prove which of two numbers written as powers is bigger?
16h
revised dimension of direct products
edited tags
16h
reviewed Close Verify the Identity
16h
reviewed Close Expected Value of conditional expectation
16h
comment Expected Value of conditional expectation
@Did: This is called "shedding downvotes". The original question was downvoted, so it was deleted and re-posted to restore those two points.