mcastillo356's latest activity
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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...
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mcastillo356 reacted to PeterDonis's post in the thread Does it make sense to build new radio telescopes? with Like.
So you think advancing science is stupid? Neither does understanding "the structure of the Universe", or indeed much scientific...
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mcastillo356 reacted to fresh_42's post in the thread Does it make sense to build new radio telescopes? with Like.
The German Wikipedia page lists five big scientific goals. I wouldn't call that negligible. We are a species that is curious and strives...