User joejacobz - Mathematics Stack Exchange

joejacobz

Member for 10 years, 10 months
Last seen more than 5 years ago

New York, United States

12 Questions

Score Activity Newest Views

22 votes

5 answers

3k views

Is high school contest math useful after high school?

asked Jan 14, 2013 at 1:24

16 votes

3 answers

9k views

Cyclic sums -- How do you use them?

asked Jan 16, 2013 at 22:54

12 votes

1 answer

2k views

Finding $x^4 + y^4 + z^4$ using geometric series

asked Aug 15, 2013 at 19:15

11 votes

2 answers

1k views

Fermat's Last Theorem's Proof

asked Jan 14, 2013 at 22:44

7 votes

3 answers

19k views

What are the real-world applications of real analysis?

asked May 5, 2013 at 14:53

6 votes

7 answers

8k views

Why isn't the derivative of $e^x$ equal to $xe^{(x-1)}$?

asked May 27, 2013 at 14:24

5 votes

1 answer

5k views

"The Original IQ Test" -- A peg puzzle

asked Sep 4, 2013 at 14:36

3 votes

4 answers

4k views

What is the value of $i^i$? [duplicate]

asked Feb 8, 2013 at 1:57

3 votes

2 answers

1k views

Contest Math Geometry

asked Jan 30, 2013 at 23:46

2 votes

1 answer

728 views

Prove $n!>2^n$ for $n\geq4$ using induction. [duplicate]

asked Feb 7, 2013 at 1:38

1 vote

0 answers

154 views

Tangents to an ellipse

asked Feb 28, 2013 at 16:05

1 vote

0 answers

411 views

What do I need to know to understand Lagrange multipliers?

asked Apr 8, 2013 at 1:27