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Mathematics
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JSchlather's user avatar
JSchlather's user avatar
JSchlather
  • Member for 13 years, 10 months
  • Last seen more than 1 year ago
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I'm around, periodically.

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107
Can you answer my son's fourth-grade homework question: Which numbers are prime, have digits adding to ten and have a three in the tens place?
Sep 20, 2011
78
Paul Erdos's Two-Line Functional Analysis Proof
Dec 19, 2012
30
Compute $\operatorname{Hom}_{\mathbb{Z}} ( \mathbb{Q}, \mathbb{Z})$
Jan 13, 2013
25
Bijection between $2^{\mathbb R}$ and $\mathbb{ R ^ R}$
Feb 2, 2011
24
Algebraic Proof that $\sum\limits_{i=0}^n \binom{n}{i}=2^n$
Jan 24, 2011
23
How is addition defined?
Dec 30, 2010
21
Normal subgroup of prime index
Jun 28, 2012
20
Why is the Long Line not a covering space for the Circle
Jun 2, 2011
17
Extensions of degree two are Galois Extensions.
Jan 19, 2013
16
Show that for a finite metric space A, every subset is open
Apr 17, 2012
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Sketches of answers in comments
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Flag Declined and How to avoid it
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How do you swap the commands for two symbols?
21
Calculating larger values of the ackermann function
17
Math Question in C or Objective C
16
How to use \bigtimes without pain
13
Is this overly clever or unsafe?