Robert D-B

Member for 8 years, 4 months
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rwdb.xyz
New Brunswick, NJ, USA

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How can we sum up $\sin$ and $\cos$ series when the angles are in arithmetic progression?

Dec 7, 2017

Are there primes arbitrarily close to powers?

Nov 23, 2019

Is every submodule of cyclic module over PID cyclic?

Jul 6, 2020

Dummit and Foote problem 11 in section 7.4

Aug 16, 2018

Find the sum $\sqrt{5+\sqrt{11+\sqrt{19+\sqrt{29+\sqrt{41+\cdots}}}}}$

Jan 20, 2019

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Are there primes arbitrarily close to powers?

Nov 22, 2019

Is $f(\sqrt{x}) + f(-\sqrt{x})$ always rational?

Jan 14, 2020

How many triangular numbers have exactly $d$ divisors?

Feb 7, 2019

Why does Herstein add all these extra hypotheses for a "simple" modules proof?

Aug 7, 2018

A game that costs the square root of your winnings

Jan 31

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