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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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  • Member for 6 years, 1 month
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  • Last seen Apr 3 at 15:14

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4 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 Is a barber a barber if he doesn't get paid? Aug 13 '18
4 How do I operate with philosophers if I reject deductive reasoning? Sep 14 '18
3 Understanding hypothetical reasoning and material implication Sep 5 '18
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
2 Is it theoretically possible for a bottomless pits to exist in a finite universe? Sep 9 '14
2 Can definition be existence (in mathematics)? May 30 '14
2 What is the principle (law) of identity and is it universal? Mar 9 '15
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