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mcastillo356 replied to the thread B Onto set mapping is the surjective set mapping, and into injective?.Yes. Simmons is being precise. Into means inyective. That's accurate, indeed. Thanks, @fresh_42 ! -
mcastillo356 reacted to fresh_42's post in the thread B Onto set mapping is the surjective set mapping, and into injective? with
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Say, we have ##f\, : \,A\longrightarrow B.## ##f## is onto if it is surjective, i.e., ##\forall\,b\in B\,\exists\,a\in A\, ... -
mcastillo356 posted the thread B Onto set mapping is the surjective set mapping, and into injective? in Set Theory, Logic, Probability, Statistics.The textbook is being fine. I asked the forum for some introduction to topology, and decided to start with Simmon`s. This naive question... -
mcastillo356 reacted to PeterDonis's post in the thread Does it make sense to build new radio telescopes? with
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So you think advancing science is stupid? Neither does understanding "the structure of the Universe", or indeed much scientific... -
mcastillo356 reacted to fresh_42's post in the thread Does it make sense to build new radio telescopes? with
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The German Wikipedia page lists five big scientific goals. I wouldn't call that negligible. We are a species that is curious and strives...