Combining Texts

Ideas for 'fragments/reports', 'The Philosophy of Art (2nd ed)' and 'Does Conceivability Entail Possibility?'

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1. Philosophy / F. Analytic Philosophy / 3. Analysis of Preconditions

20388	'Necessary' conditions are requirements, and 'sufficient' conditions are guarantees [Davies,S]
	Full Idea: A 'necessary' condition for something's being an X is condition that all Xs must satisfy. ...A 'sufficient' condition for something's being an X is a condition that, when satisfied, guarantees that what satisfies it is an X.
	From: Stephen Davies (The Philosophy of Art (2nd ed) [2016], 2.1)
	A reaction: By summarising this I arrive at the requirement/guarantee formulation, which I am rather pleased with. What is required for rain, and what guarantees rain?