Hey guys I'm working on my calc work and I have a basic question, I completely forgot this.
When you have [0,4) or [0,x) or whatever... What does the [ and ( mean... what's the difference between those?
2007-08-29 08:35:54 · 2 answers · asked by joedudez 3 in Science & Mathematics ➔ Mathematics
A parenthesis sign, ' ( ' or ' ), ' means that the set is OPEN at that end. Brackets, ' [ ' or ' ], ' means it's CLOSED at that end. OPEN means that the number or quantity associated with that symbol actually ISN'T in the set; CLOSED means that the number associated with the symbol IS in the set.
Thus [0,4) means that the set consists of all values from and INCLUDING 0 up to but NOT INCLUDING 4.
Live long and prosper.
2007-08-29 08:46:03 · answer #1 · answered by Dr Spock 6 · 1⤊ 2⤋
[0,4) means all x such that 0 ⤠x < 4
(0,4] means all x such that 0 < x ⤠4.
see the difference? the bracket means the boundary point is included in the set; the parenthesis means it's not.
2007-08-29 15:51:33 · answer #2 · answered by Philo 7 · 0⤊ 0⤋