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General Tech Learning Aids/Tools 2 years ago
Posted on 16 Aug 2022, this text provides information on Learning Aids/Tools related to General Tech. Please note that while accuracy is prioritized, the data presented might not be entirely correct or up-to-date. This information is offered for general knowledge and informational purposes only, and should not be considered as a substitute for professional advice.
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I'm learning about functions between sets. I get the concept. But I'm having a hard time drinking the kool-aid, so to speak. There's some part of my mind that thinks (loudly),
Wait. How does this author justify claiming that he can connect two things together however he likes. There has to be some justification to connect them.
But I get that -really- all a function between two sets is doing is saying is
This is what things would look like if you connected the elements of these two sets
But still, intuitively, it strikes me as potentially problematic. For instance, we used to be able to assign any element we wanted to a set - that turned out to be a problem. I don't necessarily wonder whether functions would lead to the same problem, but perhaps to some other problem arising from arbitrarily relating things?
Do functions have the potential to lead to that kind of a problem, or any other problem? Is there a better way to think of them than I've described?
Yes. Functions are arbitrary.
In modern mathematics, and in particular in set theory, a function is just a set of ordered pairs which have some properties.
One can ask, what is a natural number? The answer, intuitively, would be "you know... like 1,2,3,41,2,3,4and so on.", but that's not a mathematical answer. The mathematical answer, circular as it may be, is probably along the lines of "an element of the standard model of the Peano axioms".
And so a function is not something which necessarily coheres with our intuition, like f(x)=x+5f(x)=x+5or so. Functions are just sets which satisfy a certain property which makes them functions.
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