Question

A union B what does "union" mean? it looks like a U and also upside down sometimes

Answer 1

if it is upside down, \(\cap\) then it is not "union" but rather "intersection"

Answer 2

\(A\cup B\) is the set of all things that are in A or in B or both

Answer 3

what what does union and intersection mean?

Answer 4

for example, if \(A=\{a, b, c, d\}\) and \(B=\{c, d, e, f\}\) then
\[A\cup B=\{a, b, c, d, e,f\}\]

Answer 5

whereas \[A\cap B=\{c,d\}\]

Answer 6

ok thank you!

Answer 7

yw