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In current practice, the single 'word' "iff" is almost always read as the four words "if and only if". However, in the preface of General Topology , Kelley suggests that it should be read differently: "In some cases where mathematical content requires 'if and only if' and euphony demands something less I use Halmos' 'iff ' ".
The conjunction sī is only rarely used in classical Latin to introduce indirect questions, although this usage is found in medieval Latin and is common in Greek and in modern Romance languages such as French and Italian. The use of 'if' to make a wish, found in ancient Greek, is not usual in Latin, except sometimes in poetry.
In English conditional sentences, the antecedent (protasis) is a dependent clause, most commonly introduced by the complementizer if.Other complementizers may also be used, such as whenever, unless, provided (that), and as long as.
In these systems, a counterfactual A > B holds if and only if the addition of A to the current body of knowledge has B as a consequence. This condition relates counterfactual conditionals to belief revision , as the evaluation of A > B can be done by first revising the current knowledge with A and then checking whether B is true in what results.
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BROOKLINE - The parents of comedian and longtime late-night TV host Conan O'Brien have died within days of each other.. Dr. Thomas O'Brien died Monday at age 95, and his wife Ruth Reardon O'Brien ...