Post by: run-bandit on February 06, 2010, 01:38:52 pm
ie: interval notation
Post by: the.watchman on February 06, 2010, 01:45:59 pm
1) Interval (eg. (-3,9] is the equivalent of
2) Inequation (eg.
3) Set (eg.
Set obviously is the one with the curly brackets
Interval indicates that the variable is between the two numbers written, with a round bracket meaning not including and a square bracket meaning including.
Post by: superflya on February 06, 2010, 01:49:09 pm
Post by: the.watchman on February 06, 2010, 01:50:19 pm
and its always the rounded bracket for.
Yup
Oh and set notation can be stuff like
Post by: stonecold on February 06, 2010, 01:55:23 pm
Post by: superflya on February 06, 2010, 02:18:51 pm
oh my gosh you're killing me. i had to put up with the teacher spending like 2 hours going over this on thursday haha!
lol same. methods classses are so mehh :P
Post by: the.watchman on February 06, 2010, 02:20:06 pm
oh my gosh you're killing me. i had to put up with the teacher spending like 2 hours going over this on thursday haha!
lol same. methods classses are so mehh :P
Yeah, methods was my best subject last year and my least favourite...
I hope it picks up this year :P
Post by: the.watchman on February 06, 2010, 02:42:53 pm
so in summary:
Interval: [-4, 9)
set: R+ (although not applicable in this case) OR x: -4<=x<=0<=9
in-equation: -4<=x<=0<=9
so SET notation is the same as IN-EQUATION notation except with an (x=) in front?
AND that you can use the symbols like R+
is this correct?
More or less, but I don't get your
Also, set notation requires CURLY brackets, and it is {x: ...}
Hope this is all useful
Post by: Greggler on February 06, 2010, 07:47:14 pm
our teacher also delves really deep into the theory, and does these really hard examples for like 30minutes at which at the conclusion of doing them says "dont worry if you dont understand all of this. you wont get anything near as hard on the exam'
Post by: the.watchman on February 06, 2010, 08:51:40 pm
lol sorry the 0 was a mistake.
So set notation is curly brackets like you said, I didn't know what the earlier posts were reffering to
what's the point of it then lol?
its just a waste of writing:
{x: -4<=x<=9}
most DEFINITELY useful
The type of set notation most commonly used is the R and R+ type rather than the inequation in curly brackets.
However, it may be handy to know it in case it's used in an exam.
(btw, try learning how to use LaTeX for equation writing, it looks way better, refer to http://vcenotes.com/viki/index.php/Help:LaTeX)
Post by: stonecold on February 06, 2010, 09:07:42 pm
http://notes.vcenotes.com/?step=downloader&download=411
Post by: stonecold on February 06, 2010, 09:41:41 pm
so in summary:
Interval: [-4, 9)
set: R+ (although not applicable in this case) OR x: -4<=x<=0<=9
in-equation: -4<=x<=0<=9
so SET notation is the same as IN-EQUATION notation except with an (x=) in front?
AND that you can use the symbols like R+
is this correct?
More or less, but I don't get your(why the 0?)
Also, set notation requires CURLY brackets, and it is {x: ...}
Hope this is all useful
That is correct, but just be careful with using the correct signs. It should actually read:
{
because the 9 isn't included.
Post by: the.watchman on February 06, 2010, 09:54:05 pm
so in summary:
Interval: [-4, 9)
set: R+ (although not applicable in this case) OR x: -4<=x<=0<=9
in-equation: -4<=x<=0<=9
so SET notation is the same as IN-EQUATION notation except with an (x=) in front?
AND that you can use the symbols like R+
is this correct?
More or less, but I don't get your
Also, set notation requires CURLY brackets, and it is {x: ...}
Hope this is all useful
That is correct, but just be careful with using the correct signs. It should actually read:
{}
because the 9 isn't included.
Lol, soz, I'll be more careful... :P