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revised Is $R_K$ first countable?
Edited title.
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suggested approved edit on Is $R_K$ first countable?
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accepted Proof by Induction solution not understood
Apr
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comment Proof by Induction solution not understood
Thanks. What about this part? $(3m + 1)(3m + 2)(3m + 3)≤(3m + 3)^3 = 27(m + 1)^3$
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Apr
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comment Injection / Surjection
I totally get that now. Thanks!
Apr
22
comment Injection / Surjection
@vadim123 Well yes, but I don't know if it's injective or not at the start. The goal is to find out. So 4 & -4 are both elements of A, right? And they can't both be mapped to the same element in B, making the function NOT injective, right?
Apr
22
comment Injection / Surjection
@TheChaz2.0 This is how I like to define it. Injective means that every member of "A" has its own unique matching member in "B".link