/sci/ - Science & Math

Okay, I'm trying to study for my discrete structures class, and this is just confusing to me. I get unions of sets for the most part, but this confuses me. An example he have was A = {x: x is a natural number and x =2j, and j is a natural number}. B = {x: x is a natural number and x = j^3 and j is a natural number}.
How am I supposed to go about finding A union B and A intersection B?

>>5095669
its in the link

why do i even bother

97 + 97 + 27 + 67 + 37 + 17 + 57 = 9926315

<span class="math">\frac{\sqrt{2}}{2}[/spoiler] being the same as <span class="math">\frac{1}{\sqrt{2}}[/spoiler]

I am confused by the notation used in these permutation group things.


I have to show that:
σ ○ <a1, a2,...as> ○ σ^-1 = <σ(a1),σ(a2),...σ(as)>

Where <a1,a2,...as> ϵ Sn , σ ϵ Sn (arbitrary) and n ≥ 1.

Something to do with showing equality of maps, but not sure if σ is treated as a function or not...

>mfw that article

>>3992885
>Physics proven to be Sub-Theoretical Physics

>>3951449

>5 people on /sci/
>all these troll threads