Everyone wants rather to be pleasing to women and that desire is not altogether, though it is very largely, a manifestation of vanity. But one cannot aim to be pleasing to women any more than one can aim to have taste, or beauty of expression, or happiness; for these things are not specific aims which one may learn to attain; they are descriptions of the **adequacy** of one's living. To try to be happy is to try to build a machine with no other specification than that it shall run noiselessly.

— Letter to his brother Frank (14 October 1929), published in

The validity of usefulness, **adequacy** of popular standards can be tested only by research that violates them.

— pg 35 (Science in a Free Society (1978))

...a theorem of propositional logic if and only if f(p1, p2 ,..., pn) is a tautology . ... He (Emil L.Post) uses the word to discuss the **adequacy** of a system of functions to express all the possible truth tables (this is nowadays called truth-functional completeness). In this way he shows not only that through the connectives of Principia (? and ?) one can generate all possible truth tables but also that there are only two connectives which can, singly generate all the truth tables.

— Emil L.Post, in The Adventure of Reason: Interplay Between Philosophy of Mathematics and ..., p.104

Thus, we have three principles for increasing **adequacy** of data: if you must work with a single object, look for imperfections that record historical descent; if several objects are available, try to render them as stages of a single historical process; if processes can be directly observed, sum up their effects through time. One may discuss these principles directly or recognize the “little problems” that Darwin used to exemplify them: orchids, coral reefs, and worms the middle book, the first, and the last.

— "Worm for a Century, and All Seasons", p. 132

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