Mathematics
Dan Christensen's user avatar
Dan Christensen's user avatar
Dan Christensen's user avatar
Dan Christensen
  • Member for 12 years, 10 months
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About

A math enthusiast and creator of DC Proof, an educational freeware program to introduce students to the basic methods of proof. Visit my math blog.

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Top posts
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All Questions Answers
Score Newest
answer
108
Why is negative times negative = positive?
Nov 15, 2010
answer
90
The staircase paradox, or why $\pi\ne4$
Dec 3, 2010
answer
42
How big is infinity?
Jun 17, 2014
question
18
How to apply the recursion theorem in practice?
Jun 2, 2011
question
16
Is Pigeonhole Principle the negation of Dedekind-infinite?
Apr 24, 2013
answer
14
Why can't we use implication for the existential quantifier?
Oct 21, 2015
answer
13
What are the Laws of Rational Exponents?
Jan 29, 2016
question
9
First-order vs. set-theoretic group theory
Jan 4, 2012
answer
9
Is there a way to prove that $2+2$ really equals $4$?
Aug 14, 2014
question
9
Proving $(A\le B)\vee (B\le A)$ for sets $A$ and $B$
Jun 16, 2013
Top network posts
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15
Boolean Implication
10
Why are induction proofs so challenging for students?
7
Should my 8th graders see a proof of the Pythagorean Theorem?
6
Exponents with Negative Base; with or without Parentheses
5
Real-life exceptions to PEMDAS?

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