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peter.petrov
  • Member for 8 years, 5 months
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13 votes
5 answers
2k views

Ellipsoid but not quite

6 votes
2 answers
335 views

Find this somewhat unpleasant limit

5 votes
0 answers
149 views

Simple problem or conditions missing?!

5 votes
3 answers
110 views

Prove that $1-\frac{\sin(x)}{x} < x^2/2$ for $x \in (0, \pi/2)$

5 votes
1 answer
123 views

Prove an integral is not solvable in elementary functions

5 votes
5 answers
197 views

Determinant and inverse matrix calculation of a special matrix [duplicate]

4 votes
2 answers
196 views

How exactly is the function $x^a$ defined?

4 votes
1 answer
98 views

Two properties of $f(x) = x \ln { (\frac{2}{\pi} \arctan{x}) } $ how do I prove these?

4 votes
3 answers
187 views

Coefficient of $x^{27}$ in $(1-x^{10})^6/(1-x)^6$.

4 votes
3 answers
383 views

Simple problem on conditional geometric probability

4 votes
1 answer
105 views

Is this the idea behind Cauchy principal value?

4 votes
2 answers
105 views

Proof by somewhat convoluted "finite" induction

3 votes
1 answer
80 views

Understanding the definition of inner product by Friedberg et. al.

3 votes
2 answers
124 views

Studying a series for convergence at the boundary points

3 votes
1 answer
95 views

$(1+x)^a$ McLaurin series

3 votes
0 answers
55 views

Question about definite integrability (Riemann sense) and discontinuities

3 votes
2 answers
100 views

Prove limit is zero $A_n = \frac{(1/3)(1/3+1)\dots(1/3 + (n-1))}{n!}$

3 votes
2 answers
174 views

Examples of sum and direct sum of vector subspaces

3 votes
2 answers
86 views

Polynomials - rational root - divisibility

3 votes
2 answers
1k views

Bernoulli trials (n,p) - probability for even/odd number of successes

3 votes
3 answers
109 views

Prove equality involving binomial coefficients

3 votes
1 answer
1k views

prove increasing/decreasing sequence

3 votes
3 answers
118 views

hard time coming up with an idea to find a limit

3 votes
2 answers
277 views

The diophantine equation $ m = x^2 + 7y^2 $

3 votes
0 answers
106 views

Is this statement about change of variables in limits true?

3 votes
1 answer
135 views

Euler substitutions - indefinite integral

3 votes
3 answers
190 views

$1/(x^6 + 1)$ partial fraction decomposition, with computer?

2 votes
3 answers
99 views

The identity $\arctan(x) + \arctan(x^3) = \arctan(2x+\sqrt{3}) + \arctan(2x-\sqrt{3})$

2 votes
3 answers
272 views

Inverse of matrix - definition

2 votes
1 answer
46 views

Mean value theorem corollary - one corner case