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Doug Spoonwood

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36
Set theory: difference between belong/contained and includes/subset?
math.stackexchange.com

15
Where did mathematicians learn how to do truth tables?
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11
Solve equations $\sqrt{t +9} - \sqrt{t} = 1$
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10
Are there formal or informal hiring bans in some academic settings based on gender and/or nationality?
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10
Should a mathematical proof be 'convincing'?
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9
Why do books titled "Abstract Algebra" mostly deal with groups/rings/fields?
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8
What exactly is nonstandard about Nonstandard Analysis?
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8
Results that were widely believed to be false but were later shown to be true
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8
How to write "let" in symbolic logic
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8
Can you give me some concrete examples of magmas?
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8
What is the difference between knowledge and belief?
philosophy.stackexchange.com

7
Division by zero
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7
If $\Sigma \vdash \phi$ implies $\Sigma \vdash \varphi$ then $\Sigma \vdash \phi \to \varphi$ on propositional logic?
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7
Is there deliberate gender preferential treatment in hiring or admission in STEM fields?
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6
Funny identities
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6
Name for $(1-x)$?
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6
What has been the first theorem discovered in the history of mathematics?
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6
Generate all possible combinations of 3 digits without repetition
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6
Tautological implication
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6
Show that $f(x) = x$ if $f(f(f(x))) = x$.
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5
What is the name of this function?
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5
Difference between bijection and isomorphism?
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5
If both $P$ and $Q$ are true , how can I tell that $P$ implies $Q$?
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5
In axiomatization of propositional logic, why can uniform substitution be applied only to axioms?
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5
Give a proof that "p & ~p" implies "q"?
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5
What are some examples of "non-logical theorems" proven by Logic?
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5
How is sexism unknowingly perpetrated in academia?
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5
What post PhD path alternatives are there?
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5
Examples of mathematical discoveries which were kept as a secret
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5
Motivation for natural deduction
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