# formal logic

Definitions of formal logic
1

### n any logical system that abstracts the form of statements away from their content in order to establish abstract criteria of consistency and validity

Synonyms:
mathematical logic, symbolic logic
Types:
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Boolean algebra, Boolean logic
a system of symbolic logic devised by George Boole; used in computers
propositional calculus, propositional logic
a branch of symbolic logic dealing with propositions as units and with their combinations and the connectives that relate them
functional calculus, predicate calculus
a system of symbolic logic that represents individuals and predicates and quantification over individuals (as well as the relations between propositions)
modal logic
a system of logic whose formal properties resemble certain moral and epistemological concepts
fuzzy logic
a form of mathematical logic in which truth can assume a continuum of values between 0 and 1
alethic logic
the modal logic of necessity and possibility and contingency
deontic logic
the modal logic of obligation and permissibility
epistemic logic
the modal logic of knowledge and uncertainty and ignorance
doxastic logic
the modal logic of belief and disbelief
Type of:
logic, logical system, system of logic
a system of reasoning