The New Encyclopædia BritannicaEncyclopædia Britannica, 1983 - Encyclopedias and dictionaries |
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Page 54
... natural numbers can be adequately defined in set - theoretic terms . Moreover , given suitable axioms , standard postulates for natural - number arith- metic can be derived as theorems within set theory . LOGICAL FOUNDATIONS OF ...
... natural numbers can be adequately defined in set - theoretic terms . Moreover , given suitable axioms , standard postulates for natural - number arith- metic can be derived as theorems within set theory . LOGICAL FOUNDATIONS OF ...
Page 429
... natural selection , the origins of the concept are deeply rooted in European thought and may be traced to the early 17th century . Indeed , the practices of artificial selection of domesticated plants and animals , which so influenced ...
... natural selection , the origins of the concept are deeply rooted in European thought and may be traced to the early 17th century . Indeed , the practices of artificial selection of domesticated plants and animals , which so influenced ...
Page 632
... natural numbers . A fifth exam- ple of a countably infinite set is the rational numbers ; for each rational can be written as a positive or negative ratio of integers , ( -1 ) " p / q , with the least possible natural numbers n , p , q ...
... natural numbers . A fifth exam- ple of a countably infinite set is the rational numbers ; for each rational can be written as a positive or negative ratio of integers , ( -1 ) " p / q , with the least possible natural numbers n , p , q ...
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