Is this step of this inequation is correct,I got it from a book and I guess its wrong or may be I am missing something
How come the sign changed? To me it doesnt make any sence.
The essence of mathematics lies in its freedom - Georg Cantor
Looks like a typo.
In mathematics, you don't understand things. You just get used to them.
It's wrong. The sign should've stayed the same...
Taking a new step, uttering a new word, is what people fear most. ― Fyodor Dostoyevsky, Crime and Punishment
The knowledge of some things as a function of age is a delta function.