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Dan Christensen

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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  • dcproof.com
  • Member for 4 years, 7 months
  • 153 profile views
  • Last seen 11 hours ago

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Top Posts (76) All Questions Answers | Votes Newest

5 What are the “undefinable numbers” in real analysis and philosophy? Nov 20 '15
4 “→” is the symbol for material implication. Is there such a thing as “immaterial implication”? Mar 18 '15
4 How do I operate with philosophers if I reject deductive reasoning? Sep 14
3 Can Euclid's Elements be used to rigorously prove 2+2=4? Jun 21 '14
3 What is illogical: 'No one would go to Hitler’s funeral if he was alive today’? Aug 22 '14
3 Is a barber a barber if he doesn't get paid? Aug 13
2 Understanding hypothetical reasoning and material implication Sep 5
2 Basic Logic: Presuming Truth Sep 10
2 Validity of mathematical induction Apr 5
2 Can definition be existence (in mathematics)? May 30 '14
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