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seen Mar 28 at 23:11

Jan
8
awarded  Popular Question
Nov
19
awarded  Yearling
Nov
1
awarded  Popular Question
Oct
26
awarded  Popular Question
Jun
8
awarded  Constituent
Jun
8
awarded  Caucus
Nov
19
awarded  Yearling
Sep
23
accepted Why exactly can you take the absolute value of one side of this inequality and assume it is still true?
Sep
22
asked Why exactly can you take the absolute value of one side of this inequality and assume it is still true?
Sep
20
accepted Why is it that $\left|b_n - b \right| < \frac{\left|b \right|}{2} \Rightarrow \left| b_n \right| > \frac{\left|b \right|}{2}$?
Sep
20
comment Why is it that $\left|b_n - b \right| < \frac{\left|b \right|}{2} \Rightarrow \left| b_n \right| > \frac{\left|b \right|}{2}$?
Thanks to all of you for your help! Part of what I overlooked is that $|b_n - b| = |b - b_n|$... I think I was trying to do this, but I kept getting $\frac{3|b|}{2}$ or something... Anyway, I think it makes sense to me finally :)
Sep
20
asked Why is it that $\left|b_n - b \right| < \frac{\left|b \right|}{2} \Rightarrow \left| b_n \right| > \frac{\left|b \right|}{2}$?
Sep
7
accepted What is the explanation for the elements of this set?
Sep
7
revised What is the explanation for the elements of this set?
edited body
Sep
7
comment What is the explanation for the elements of this set?
by the way I hope that $f(A)$ is the correct notation for the range of the function.
Sep
7
comment What is the explanation for the elements of this set?
thank you, that definitely helps a lot. I still have to ask: in order to "note that $B$ is not in the range of the function" we then need to consider the range of the function to be $\{ \{ a\}, \{ a,c\} \{ a,b,c\}\}$ as I wrote in the question? And that's why $B = \{b\} \notin f(A)$? Is that correct? In other words $B$ is a set, but the important observation is that it is not an element of the range of the function?
Sep
7
comment What is the explanation for the elements of this set?
Sorry, those weren't actually my solutions, I've updated the question to hopefully make that more clear...
Sep
7
revised What is the explanation for the elements of this set?
added 103 characters in body
Sep
7
asked What is the explanation for the elements of this set?
Aug
21
awarded  Electorate