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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 7 years
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  • Last seen Mar 12 at 16:17

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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 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 What is illogical: 'No one would go to Hitler’s funeral if he was alive today’? Aug 22 '14
3 Can Euclid's Elements be used to rigorously prove 2+2=4? Jun 21 '14
3 Understanding hypothetical reasoning and material implication Sep 5 '18
2 Basic Logic: Presuming Truth Sep 10 '18
2 Is there a rigorous definition of ‘everything’? Oct 13 '18
2 How to get proof using proof editor and checker Oct 24 '18
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