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Existential instantiation

In predicate logic, existential instantiation (also called existential elimination) is a valid rule of inference which says that, given a formula of… 
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Papers overview

Semantic Scholar uses AI to extract papers important to this topic.
2017
2017
Unit-2 Rules of Universal Instantiation and Generalization, Existential Instantiation and Generalization, and Rules of Quantifier Equivalence
2016
2016
Naturalizing Natural Deduction
A simplified and improved system of natural deduction for classical predicate logic is presented. The inference rules of… 
2010
2010
Epistemic Term-Modal Logic
In the present paper syntax, constant domain semantics with non-rigid constants and an axiom system for n agent systems with… 
2006
2006
Variable declarations in natural deduction
1997
1997
Existential Instantiation and Strong Normalization
We present a new manageable formulation of natural deduction with a rule of existential instantiation ∃xA[x]/A[b]. It simplifies… 
1992
1992
Herbrand Methods in Sequent Calculi: Unification in LL
We propose a reformulation of quantiiers rules in sequent calculi which allows to replace blind existential instantiation with… 
1982
1982
Logic and Argument Analysis: An Introduction to Formal Logic and Philosophic Method (REVISED)
Given any conditional: (1) P => Q We may transpose* and negate its antecedent and consequent: (2) -Q => -P Given any conditional… 
1973
1973
Existential instantiation in a system of natural deduction for intuitionistic arithmetics
1967
1967
A note on existential instantiation
The presence of a rule for existential instantiation (EI) in a system of natural deduction often causes some difficulties, in… 
1956
1956
Another variant of natural deduction
Since 1934 various different techniques for natural deduction have been developed by Gentzen, Jaśkowski, Rosser, Quine, and… 
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