# Assumption \$d>2\$ on Proposition 2.12 from Knapp’s Elliptic Curves

I’m going through Knapp’s book on elliptic curves and I got stuck in a minor detail.

This is a part of the proof of Proposition 2.12:

I could understand everything except for this little detail: Where are we making use of the assumption $$d>2$$?

I will post some pictures about the references that the proof makes use of, in order for you to understand the whole argument.

Proposition 2.7 and identity (2.12):

Lemma 2.11: