Mathematics
MarnixKlooster ReinstateMonica
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(Except I encourage you to read an ex-moderator's https://meta.stackexchange.com/q/336526/157152 note.)

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13
Proof: $A \neq \emptyset \implies A \nsubseteq \emptyset $
Mar 16 '13
12
Online tools for checking validity of classical, intuitionistic, ... logic formulas?
Feb 2 '15
10
Prove that $\mathcal{P}(A)⊆ \mathcal{P}(B)$ if and only if $A⊆B$.
Mar 16 '13
9
Prove every odd integer is the difference of two squares
Dec 29 '13
8
Why so many 'multi-part' definitions, as opposed to 'unified' ones?
Feb 15 '16
8
Prove/Disprove that if two sets have the same power set then they are the same set
Mar 16 '13
8
how to prove $f^{-1}(B_1 \cap B_2) = f^{-1}(B_1) \cap f^{-1}(B_2)$
Oct 6 '13
7
What is the pattern in these ordering properties?
Apr 26 '17
6
Is this alternative definition of 'equivalence relation' well-known? useful? used?
Jun 20 '13
6
Quantifiers, predicates, logical equivalence
Oct 3 '13
Top Meta posts
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21
Should I fix my 175 posts that use \newcommand without \begingroup?
5
Please delete misspelled (ananlysis) tag
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How do I get the 'clear' command in Cygwin?
199
How do I get the 'clear' command in Cygwin?
138
Explain "claims-based authentication" to a 5-year-old
59
IIS application using application pool identity loses primary token?
35
IIS application using application pool identity loses primary token?

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