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...
Here lies the reader who will never open this book. He is forever dead.