# proof of Nielsen-Schreier theorem and Schreier index formula

## Primary tabs

Type of Math Object:
Proof
Major Section:
Reference

## Mathematics Subject Classification

After a couple of PMs undoubtedly thinking the other was an idiot, mathprof and I have stumbled on to a weird bug -- The word "graph" in this entry links to the correct phrase in page images mode, but a different entry in html mode. Or is this a "feature"? Is there an easy fix?

Cam