Example of Cut in Natural Deduction and how to remove it
104871
Direct cut-elimination for natural deduction.
80183
Deduction of "Disjunction elimination"
154910
Calculus Reduction Formula
54882
How can I remove the qed symbols from all lemma proofs?
82739
Why is $\alpha \rightarrow \forall x(\alpha)$ not generally correct in first-order logic?
53056
natural deduction: introduction of universal quantifier and elimination of existential quantifier explained
63701
An example of a regular function over an open set
77087
Use slice notation with collections.deque
129693
An interesting problem with "decomposing" natural numbers.
47135
Prove if a = b, then f(a) = f(b) for any function f (with natural deduction)
108028
Is there a bijection between the reals and naturals?
9077
Proof that no term (of a language of predicate logic) is a (non-empty) initial segment of another
142762
how to prove that (P⊃Q)≡(¬Q⊃¬P) ( P ⊃ Q ) ≡ ( ¬ Q ⊃ ¬ P ) is disallowed in intuitionistic logic?
92492
Natural Deduction: $(p \lor q)\to r\vdash p \to r$ and $p\to\neg q\leftrightarrow(r\lor s),\neg s\vdash (p\land \neg q)\to r$
151356
Need Hints Prove "$((\neg \alpha \to \alpha) \to \alpha) $" Using Axiom 1,2,3 and MP and deduction theorem
48606
Help with a Predicate Logic homework proof
120102
How to explicitly discard an out argument?