History of Model theory

	Revision 10 . . November 27, 2001 6:05 pm by The Anome [Added -> informal mathematical model]
	Revision 9 . . November 12, 2001 5:50 pm by Iwnbap

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Difference (from prior major revision) (no other diffs)

Added: 28a29,31

Note: The term 'mathematical model' is also used informally in other parts of mathematics and science.