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单词 θ115388
释义
the world > relative properties > number > arithmetic or algebraic operations > transformation > [adjective] > having specific correspondence > of mapping into or onto (3)
to be on about1907

colloquial. to be on about: to keep talking about, to harp on, to speak or write about (a subject). to be on at (also to be on to): to nag or…

on to1942

Mathematics. In form onto. Designating a mapping of one set on to another. Cf. into, adj.

into1949

Mathematics. Used to designate a mapping (of one set ‘into’ another (sense A. 6a)) that is not necessarily ‘onto’.

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