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May
14
awarded  Caucus
Apr
11
comment Proof of Proposition/Theorem V in Gödel's 1931 paper?
Yes, you are right. I take back my comment.
Apr
11
comment Proof of Proposition/Theorem V in Gödel's 1931 paper?
Two minor remarks. For projections you should take the formula $x_1=x_1\wedge\ldots\wedge x_n=x_n\wedge y=x_i$, similarly for the zero function the proper formula is $x=x\wedge y=0$.
Apr
5
revised Why is it impossible to define multiplication in Presburger arithmetic?
corrected spelling and style
Apr
2
answered Why is it impossible to define multiplication in Presburger arithmetic?
Nov
19
awarded  Revival
Oct
14
revised Proof that $\overline{A \cap B} \subseteq \overline{A} \cap \overline{B}$
deleted 838 characters in body
Oct
13
comment Proof that $\overline{A \cap B} \subseteq \overline{A} \cap \overline{B}$
Not exactly, I venture to say, since Andres uses properties which you are required to prove from the definitions in OP's question.
Oct
13
answered Proof that $\overline{A \cap B} \subseteq \overline{A} \cap \overline{B}$
Sep
5
answered Use of undecidability
Sep
4
revised Axiomatic system and Hilbert's 2nd problem
Corrected a sentence which could cause misunderstanding.
Sep
4
suggested suggested edit on Axiomatic system and Hilbert's 2nd problem
Sep
3
awarded  Revival
Sep
3
awarded  Supporter
Sep
2
answered What is the difference between Completeness and Soundness in first order logic?
Aug
31
awarded  Editor
Aug
31
comment Russell Paradox and set theories
@Asaf: I edited my answer a bit. Hope you can read my intentions now.
Aug
31
revised Russell Paradox and set theories
added 354 characters in body
Aug
31
awarded  Teacher
Aug
31
answered Russell Paradox and set theories