i've been reading Elements of Abstract and Linear Algebra for a cryptology report.
i have a basic highschool education in algebra, geometry, and a little trig.
anyway i'm seeing lots of symbols i've never seen before.
i cant cut and paste them.
anyone know the names of these symbols or something i can use to find out more about them?
Try to help all less knowledgeable than yourself, within
the limits provided by time, complexity and tolerance.
- Nor
Most likely if you don't know what a symbol is you should take a class that covers that level of math.
take university level discrete math and linear algebra
the big funky E is the summation operator where you just add elements of an array together
the ~ means approximately equal to (i.e trying to assign a value to an irrational number)
the small e is the only number (rational or irrational, e is irrational) where the derivative of e^x is e^x (I think that's how it goes)
e is:
2.718281828459045235360287471352662497757247093699 95957
and those are the first 3 relevant symbols I could think of that might be in your book
What symbols specifically? Can you point me to a chapter at least?
"...the results are undefined, and we all know what "undefined" means: it means it works during development, it works during testing, and it blows up in your most important customers' faces." --Scott Meyers
A good number of the operators are described in the first pages of chapter 1.
Wave upon wave of demented avengers march cheerfully out of obscurity unto the dream.
logic and discrete mathematics - a computer science perspective, i read it in maths in the first of uni. I forget the author but its a good book
Monday - what a way to spend a seventh of your life
in chapter one. page one. right after the header Sets.
there is an up side down 'u' and a right side up 'U'
also "{x: E A and x E B"} E being the symbol i dont understand.
a little more down (page 6) is an arrow pointing right.
and then a little circule used like multiplacation, at the bottom of that page.
these 5 symbols are used throught out the book and one only ones i dont understand.
Try to help all less knowledgeable than yourself, within
the limits provided by time, complexity and tolerance.
- Nor
upside down 'U' : think of it as an 'and'Originally posted by Nor
in chapter one. page one. right after the header Sets.
there is an up side down 'u' and a right side up 'U'
also "{x: E A and x E B"} E being the symbol i dont understand.
a little more down (page 6) is an arrow pointing right.
and then a little circule used like multiplacation, at the bottom of that page.
these 5 symbols are used throught out the book and one only ones i dont understand.
rightside up 'U' : think of it as an 'or'
small 'E' : 'element of'
backwards 'E' : 'there exists'
upside down 'A': 'for all'
and the ' : 'not' (negation)
>> {x: E A and x E B"}
assuming the E's are small this means x is an element of A and x is an element of B.
if you want better descriptions, look up "set theory" or "set notation"
edit: edited stuff
Last edited by Perspective; 08-08-2003 at 10:12 AM.
thank you so very much.
also just found a book about the subject.
Schaum's Outline of Discrete Mathematics (amazon.com)
should be here within the next week
http://www.sosmath.com/algebra/inequ...02/ineq02.html
http://www.shu.edu/projects/reals/logic/notation.html
http://directory.google.com/Top/Scie...t_Theory/?il=1
Last edited by Nor; 08-08-2003 at 10:28 AM.
Try to help all less knowledgeable than yourself, within
the limits provided by time, complexity and tolerance.
- Nor
