/sci/ - Science & Math

>>11818857
I wish I had a hobby other than posting to these threads with a decreasing quality.

>>11610545
Okaydokay, now it makes a lot more sense! Now you should try to show that if you take any point on the boundary of that set, the sum of the distances from that point to 1 and -1 is constant.

>>11610568
A good way to get started with things like de Morgan or any other case where you are supposed to show that two sets are the same is to simply check that they contain one another. If we can show that [math]x \in A[/math] implies [math]x\in B[/math], then [math]A \subseteq B[/math]. If we also have [math]x \in B \implies x\in A[/math], then [math]B \subset A[/math], and so [math]A = B[/math]. If you have energy and time, you can try [math](A \cup B)^c = A^c \cap B^c[/math] like that. Did you make progress today?