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Daniel Mak

An idiot who has always been hopeless in maths - this website is a lifesaver for someone like me.

I would like to sincerely thank everyone who has helped me with/answered my questions on MathSE. Your help is really appreciated.

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  • Member for 5 years, 10 months
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  • Last seen Feb 26 at 8:26

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9 Proving the inverse of a bijection is bijective Nov 6 '15
6 Questions on how to prove that a set of connectives is NOT functionally complete Jan 31 '18
5 Why is the left-intro rule in Sequent Calculus equivalent to elimination rule in Natural Deduction? May 28 '19
5 Show that if $\langle f,g\rangle=\langle k,h\rangle$ then $f=k$ and $g=h$ Oct 3 '19
4 Whiskering a natural isomorphism yields a natural isomorphism Mar 16 '20
4 Show that if $T$ is a Skolem theory in $L$, then $T$ is a Skolem theory in $L'$ Jun 1 '19
4 If $g\circ f$ is monic, so is $f$ Sep 3 '19
4 Confused: examples of homomorphism from $(\Bbb N,+)$ to $(\Bbb Z,+)$ and from $(\Bbb N,<)$ to $(\Bbb Z,<)$ Sep 8 '19
4 Circular definition in proof Jan 20 '16
4 Showing that the union of transitive relations need not be transitive. Sep 28 '16
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