Math Help - A question regarding Bertrand's postulate (Erdős proof)...

1. A question regarding Bertrand's postulate (Erdős proof)...

Proof of Bertrand's postulate - Wikipedia, the free encyclopedia

I don't understand why the product in red underline less than the product in the red box in the attachment.

Thank you!

2. Re: A question regarding Bertrand's postulate (Erdős proof)...

Think I got it...

Lemma 3 insures it. If $p>\sqrt{2n}$ then $R(p,n)$ is 1 or 0.

Right?