1.) [u-v, u+v] = [u-v, u] + [u-v, v] (Additivität)
= [u, u] + [-v, u] + [u, v] + [-v, v] (Additivität)
= [u, u] - [v, u] + [u, v] - [v,v] (Homogenität)
= [u, u] + [u, v] + [u, v] - [v,v] (alternierende Eigenschaft)
= o + 2[u,v] - o = 2[u,v]
2.) [u + kv, v] = [u, v] + [kv, v] (Additivität)
= [u,v] + k[v,v] (Homogenität)
= [u,v] + k*o
= [u,v] + o = [u,v]