i saw this simbol when i was searching answer from the net....
please help me to find out...is very important to me.
2006-12-21 14:42:49 · 3 answers · asked by qian 1 in Science & Mathematics ➔ Mathematics
Additinal??? Hmmm don't know that one, but besides the ones already mentioned (wt in lbs, cardinality of a set) it is also used by prime searchers as the product of all primes <= p so for instance 5#=2*3*5 and 23#=2*3*5*7*11*13*17*19*23, etc.
2006-12-21 15:21:43 · answer #1 · answered by a_math_guy 5 · 0⤊ 0⤋
If S is a set with finitely-many elements, sometimes people write #S to indicate the number of elements in this set.
For example, if S = {2,3,5,7}, then #S = 4.
Hope this helps.
2006-12-21 15:10:04 · answer #2 · answered by robert 3 · 0⤊ 0⤋
The # is usually used to indicate weight in pounds. It is called the pound sign.
2006-12-21 14:51:27 · answer #3 · answered by Paca 2 · 0⤊ 0⤋