
#1
Jan1314, 06:20 AM

P: 17

[a;b[
I want to do a problem with this but i can't find anything about it, if anyone can help me it'd be very useful, thank you. :) The one i want to do exactly is [20;30[ , in case anyone is wondering. 



#2
Jan1314, 08:06 AM

P: 742

Google says...
http://en.wikipedia.org/wiki/ISO_3111#Sets The endpoint of an open interval can be expressed with an outwardfacing square bracket which is synonymous with an inwardfacing parenthesis. 



#3
Jan1314, 01:32 PM

Mentor
P: 20,933

In other words, [20;30[ means {x  20 ≤ x < 30}, the interval on the real number line between 20 and 30, with 20 included and 30 excluded.




#4
Jan1414, 08:12 AM

Math
Emeritus
Sci Advisor
Thanks
PF Gold
P: 38,877

What does this notation mean?
Perhaps you are familiar with [20, 30), another notation meaning the same thing all numbers between 20 and 30, including 20 but not 30.



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