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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

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2017
2017
Unit-2 Rules of Universal Instantiation and Generalization, Existential Instantiation and Generalization, and Rules of Quantifier Equivalence
2016
2016
The pedagogy of most contemporary symbolic logic textbooks is firmly rooted in the natural deduction systems of
PARC is an “appended numeral” system of natural deduction that I learned as an undergraduate and have taught for many years… 
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… 
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…