# proof that all subgroups of a cyclic group are cyclic

## Primary tabs

Major Section:
Reference
Type of Math Object:
Proof
Parent:

## Mathematics Subject Classification

### A puzzle

About a year ago I had given a sketch proof of the infinitude of primes having the form x^2 +1 (using failure functions ).

Today when I searched for” sketch proof ” the search did not reveal this topic

Wonder whether this has been deleted, Could anyone pl enlighten me?

A.K. Devaraj