On Monday, 27 June 2016 17:32:08 UTC+3, Wang Yarco wrote:
>
> First, i should say very sorry to you, guys. (It is also not for golang
> itself, but i think you may have interests on this. Just for some advice)
> Original Post
> <https://www.google.com/url?q=https%3A%2F%2Fwww.linkedin.com%2Fgroups%2F33207%2F33207-6153064731369295874&sa=D&sntz=1&usg=AFQjCNFgOLNiyfoNqKvkWYaIFAIgQ8MDTg>
>
People that aren't member of the group cannot see the post. (including me)
> When i'm reading something about sets operators, i feel strange when
> comparing to normal arithmetic process, i mean resolving equations like:
> x + y = 5
> x - y = 3
> is very easy, we don't have to draw some diagrams.
>
This is only because you have learned to resolve the calculations in your
head without needing to do it on the paper. If you give the same equations
to a child learning equations systems, they will need to do it on paper as
well.
> But it is not clear except you draw venn diagram when dealing with sets:
> A - B = {3}
> A ∩ B = {4}
> (we could get A = {3, 4} here, but we can not do normal arithmetic
> comparing to above)
>
If you show that: A = (A - B) ∪ (A ∩ B), finding the solution becomes
trivial.
> Then, i think maybe they (the scientists who do math) didn't create enough
> operators for sets.
>
∩ ∪ \ - △ ' Ø *U*
Can describe all the outcomes given two sets. (note, the symbols may vary
slightly)
So i add the two (actually 1 operator, 1 mark) "+" and "*":
>
> A+B is equal to A U B, but also mean no having repeated numbers
>
There are no repeated elements in sets. Are you thinking of multisets?
> ( A ∩ B = ∅)
> A* means "the rest part of A"
>
Rest relative to which set?
(of cause, they are not very strictly defined...)
>
> Then, the calculation process seems more easy (without drawing a venn
> diagram):
> A - B = {3} <= actually => A* = {3}
> A ∩ B = {4} <= actually => A* + {4} = A, B* + {4} = B
> Then, it is clear that:
> A = {3, 4}
>
> (Just an idea...)
>
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