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Wesley
  • Member for 7 years, 7 months
  • Last seen more than 1 year ago
  • Berkeley, CA, USA
27 votes
5 answers
4k views

Why does notation for functions seem to be abused and ambiguous?

9 votes
4 answers
275 views

Evaluate the integral $\int_0^{\infty}e^{-x} \sin x \log x ~ dx$

9 votes
7 answers
503 views

Show that $\lim_{n \to \infty} \int_0^{\infty} \frac{1}{1+x^n}~dx = 1$

8 votes
3 answers
295 views

$C_1$ and $C_2$ are non-crossing if they are translates of a convex disc

7 votes
1 answer
1k views

Pigeonhole Principle Problem

7 votes
3 answers
12k views

Why does $\ker(T) = \{0\} \Leftrightarrow T$ is injective

6 votes
3 answers
158 views

Five numbers whose difference is their gcd

3 votes
1 answer
2k views

Showing that the Dirichlet function has no limit

3 votes
1 answer
99 views

Infinitely many of $1,11,111,\dots$ is divisible by $2^{2019}+1$

3 votes
1 answer
72 views

Decomposing a convex quadrilateral

3 votes
1 answer
119 views

Justification for cancelling variables in a rational expression

3 votes
1 answer
150 views

Cancelling variable factors in a rational function

3 votes
2 answers
1k views

Zero-based numbering vs. one-based numbering for sequences

3 votes
5 answers
435 views

A complete residue system from an arithmetic progression

2 votes
1 answer
121 views

Existence of basis of $P_2$ with no polynomial of degree 1

2 votes
3 answers
64 views

How to prove a formula involving polynomial sequences and their recursive representation

2 votes
1 answer
2k views

What is the difference between a multivariate function and a vector-valued function?

2 votes
1 answer
4k views

Cases of reversible and irreversible operations in algebra

2 votes
1 answer
2k views

Pulling a negative out of a square root

2 votes
3 answers
81 views

Motivation for completing the rationals and proving that $x^2=2$ has a real solution

2 votes
1 answer
562 views

Contrapositive of a quantified statement

2 votes
2 answers
2k views

Computing $S(n,3)$, Stirling number of 2nd kind

2 votes
3 answers
98 views

Does the equation $a^2+d^2+4=b^2+c^2$ have any solutions?

2 votes
3 answers
97 views

$f(n)+f(m) = q^2$ always has a solution

2 votes
1 answer
119 views

Infinite set of positive integers such that no subset sum is a square

2 votes
2 answers
175 views

Interpreting a problem in combinatorial geometry

2 votes
0 answers
503 views

Geometric mean of a sequence converges

2 votes
1 answer
242 views

Group ring isomorphic to matrix ring

2 votes
2 answers
353 views

Show that a ring of fractions and a quotient ring are isomorphic

1 vote
0 answers
94 views

The cases in proving that a group of order 90 is not simple