What is the best reference handbook in math?
I am an undergraduate math student.
I need a handbook in case something skips my mind like a function or formulas .... In the huge field of math that happens a lot.
I need a handbook because I find it hard to carry my library around. and math...
Let x be an irrational number. Show that the absolute value of the difference between jx and the nearest integer to jx is less than 1/n for some positive integer j not exceeding n.
The Attempt at a Solution
Ok, I know that it should be solved using...