Symbols

Question 1

What does ∑ indicate?

Answer 1

∑ indicates a sum of terms.
For example:
∑_(k=0)^∞▒〖x^k=1+x+x^2+x^3+⋯〗

Question 2

What does ∏ indicate?

Answer 2

∏ indicates a multiplication of terms.
For example:
∏_(k=1)^N▒〖(x-a_k )=〗 (x-a_1 )(x-a_2 )(x-a_3 )*… *(x-a_N )

Question 3

What does it mean when s ∈ A ?

Answer 3

s belongs to set A/s is part of set A

https://drive.google.com/file/d/1eJL1a94UtY2vjwJ47bmLsXj4e153Wbuu/view?usp=sharing

Question 4

What does s ∉ B mean?

Answer 4

s does not belong to set B/s is not part of set B

https://drive.google.com/file/d/195z6m78YN5iRZINjpAUfJW-J69Ji4qIk/view?usp=sharing

Question 5

How would you denote that s belongs to the intersection of A and B?

Answer 5

s ∈ A ∩ B
Note: ∩ = ‘and’
https://drive.google.com/file/d/1Sh9bUUtey4SiBOW1EjNZ4Ch-ErKvuaYt/view?usp=sharing

Question 6

What does it mean when s ∈ A ∪ B?

Answer 6

s belongs to the union of A and B

note: ∪ = ‘or’
https: //drive.google.com/file/d/1SH9Q5dwXo2O10hfkV5aBf77WaPcfz6Ro/view?usp=sharing

Question 7

What does ∀s mean?

Answer 7

For all s