Some symbols that are commonly treated as logical constants are: For many logical constants also other symbols are commonly used to denote them, such as the symbol `&` for logical and. One of the fundamental questions in the philosophy of logic is `What is a logical constant?`; that is, what special feature of certain constants makes them logi...
Found on
http://en.wikipedia.org/wiki/Logical_constant
(from the article `metalogic`) ...systems of elementary logic comprise the correct formulation, provided that the actual choice of the truth functions (say negation and ... ...`the logic of science,` `inductive logic,` and so on. According to the narrower conception, logical truths obtain (or hold) in virtue of certa...
Found on
http://www.britannica.com/eb/a-z/l/66
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