The union of sets A and B, that is, the set of all elements that are either in A or B (or both).
What does length mean in math
Communitive means of, or belonging to, a community. It has no meaning in math. Communative does not mean anything - in math or elsewhere.
the mean is the average
What does > mean?
The word "mean" in math means the same thing as average. Mean is just a nickname for average.
I assume that with n(...) you mean the size of the set. It sure can; but it need not be.
Max Aub's birth name is Max Aub Mohrenwitz.
Carmen Aub's birth name is Carmen Aub Romero.
Aub Hodgson died in 1982.
Aub Hodgson was born in 1912.
Aub Lawson was born in 1915.
Matt Aub was born on 1972-02-29.
Aub Lawson died on 1977-01-20.
Max Aub was born on June 2, 1903, in Paris, France.
Max Aub died on July 22, 1972, in Mexico, D.F., Mexico.
Carmen Aub was born on October 24, 1989, in Mexico City, Distrito Federal, Mexico.
Sabena OO-AUB Ostend crash happened on 1937-11-16.