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5-Ethyl-2-methylpyridine is produced by condensation of paraldehyde (a derivative of acetaldehyde) and ammonia: [2]. 4 CH 3 CHO + NH 3 → (C 2 H 5)(CH 3)C 5 H 3 N + 4 H 2 O. The conversion is an example of a structurally complex compound efficiently made from simple precursors.
In the mathematics of binary relations, the composition of relations is the forming of a new binary relation R ; S from two given binary relations R and S.In the calculus of relations, the composition of relations is called relative multiplication, [1] and its result is called a relative product.
A partition of a set X is a set of non-empty subsets of X such that every element x in X is in exactly one of these subsets [2] (i.e., the subsets are nonempty mutually disjoint sets).
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