Chevalley group of type E7

Definition
Let $$K$$ be a field.

The Chevalley group of type $$E_7$$ over $$K$$, denoted $$E_7(K)$$, is defined as the group corresponding to the Dynkin diagram:



For a prime power $$q$$, $$E_7(q)$$ is defined as the group $$E_7(\mathbb{F}_q)$$.