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・ Inclined tower
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・ Inclinometer
・ Inclosure Act 1773
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・ Include (horse)
・ Include directive
・ Include guard
・ Include Me Out
・ Included angle
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・ Inclusion (Boolean algebra)
・ Inclusion (disability rights)
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Inclusion (logic)
・ Inclusion (mineral)
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・ Inclusion (value and practice)
・ Inclusion and Democracy
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・ Inclusion compound
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・ Inclusion Hill
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Inclusion (logic) : ウィキペディア英語版
Inclusion (logic)
In logic and mathematics, inclusion is the concept that all the contents of one object are also contained within a second object.
The modern symbol for inclusion first appears in Gergonne (1816), who defines it as one idea 'containing' or being 'contained' by another, using the backward letter 'C' to express this. Peirce articulated this clearly in 1870, arguing also that inclusion was a wider concept than equality, and hence a logically simpler one.〔"Descr. of a notation", CP III 28.〕 Schröder (also Frege) calls the same concept 'subordination'.〔Vorlesungen I., 127.〕
==References==



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