User apnorton - Mathematics Stack Exchange

apnorton

Member for 11 years, 8 months
Last seen more than a month ago

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Virginia, USA

458 Answers

Score Activity Newest

37 votes

Accepted

When to do u-substitution and when to integrate by parts

answered Oct 24, 2013 at 21:51

35 votes

Prove that $1 + 4 + 7 + · · · + 3n − 2 = \frac {n(3n − 1)}{2}$

answered Dec 4, 2014 at 2:45

32 votes

Accepted

Why does one counterexample disprove a conjecture?

answered Jul 10, 2013 at 22:44

30 votes

Interview riddle

answered Jul 14, 2014 at 18:19

28 votes

Accepted

Moving point along the vector

answered Mar 18, 2013 at 1:24

25 votes

Why do we still do symbolic math?

answered Jul 29, 2014 at 16:31

24 votes

Is there any "superlogarithm" or something to solve $x^x$?

answered Jun 11, 2013 at 17:19

22 votes

Finding circumference without using $\pi$

answered Jan 16, 2013 at 23:39

20 votes

Difference of mapsto and right arrow

answered Aug 22, 2013 at 1:59

16 votes

What was the first bit of mathematics that made you realize that math is beautiful? (For children's book)

answered Mar 7, 2013 at 15:26

15 votes

Factorial of 1,e+80

answered Apr 29, 2014 at 15:23

15 votes

Gap year to study math

answered Jul 3, 2014 at 18:09

14 votes

Accepted

Can someone explain this trigonometric limit?

answered Aug 14, 2013 at 21:44

14 votes

Can the inverse of a function be the same as the original function?

answered Oct 27, 2013 at 20:54

13 votes

Find the volume of the largest right circular cone that can be inscribed in a sphere of radius r?

answered Oct 31, 2012 at 1:32

12 votes

7 Drinks - 7 Flavors - Infinite variety?

answered Dec 9, 2012 at 19:45

12 votes

De-Morgan's theorem for 3 variables?

answered Mar 4, 2013 at 19:26

12 votes

Accepted

Evaluating the primitive $\int \frac{\mathrm dx}{e^{2x} + e^x + 1} $

answered Jan 4, 2014 at 21:47

12 votes

Accepted

Patterns of no formula.

answered Jun 11, 2014 at 12:13

11 votes

Nested Summation

answered Feb 24, 2013 at 13:13

11 votes

Is a function that has a vertical tangent line a function?

answered Feb 21, 2013 at 1:26

11 votes

Accepted

How do I know when to use nCr button and when to use nPr button on my calculator in which situation?

answered Jun 25, 2013 at 23:00

11 votes

Accepted

Concepts of Modern Mathematics (Ian Stewart) - 751=7.107+2?

answered Sep 1, 2013 at 15:23

10 votes

Boolean Algebra (Help Needed)

answered Feb 21, 2013 at 2:15

10 votes

Accepted

Let $a=43120$ How many positive divisors does a have?

answered Dec 10, 2014 at 20:08

9 votes

Accepted

Can I really factor a constant into the $\min$ function?

answered Feb 7, 2013 at 3:46

9 votes

Units of a log of a physical quantity

answered Nov 16, 2012 at 2:47

9 votes

Prove that if $n$ is not divisible by $5$, then $n^4 \equiv 1 \pmod{5}$

answered Jul 19, 2014 at 0:31

8 votes

Accepted

Find integral from 1 to infinity of $1/(1+x^2)$

answered Dec 8, 2012 at 20:33

8 votes

Quantifier Notation

answered Mar 25, 2013 at 0:06

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