for this: {0,3,6,9,12}
S={x|x N , x is multiply of 3, x 12}
S={x|x is multiply of 3 and 0 x 12}
Which one is correct and more valid?
and how to write for this one: {m,n,o,p} ?
Hello zpwnchenFirst, let's be clear that the word you want here is multiple, not multiply.
Secondly, there are two interpretations of , the natural numbers: it's either the positive integers, or the non-negative integers, . So unless you state which of these two definitions is being used, then it's best to avoid using here.
The clearest notation to use, then, is is a multiple of 3 and .
You could define {m, n, o, p} in a variety of ways; for example, { is a lower-case letter and follows l and precedes q in alphabetical order}
Grandad