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It is often said that the hypothesis is the ''[[sufficient condition]]'' of the thesis, and the
thesis the ''[[necessary condition]]'' of the hypothesis; that is to say, it is sufficient that the hypothesis be true for the thesis to be true; while it is necessary that the thesis be true for the hypothesis to be true also. When a theorem and its reciprocal are true we say that its hypothesis is the [[necessary and sufficient condition]] of the thesis; that is to say, that it is at the same time both cause and consequence.
[[he:שקילות]]
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