Polarization identity
= Polarization identity
{wiki}
Over a field of characteristic other than two, a quadratic form recovers its symmetric bilinear form by
$$
B(u,v)=\frac12\bigl(Q(u+v)-Q(u)-Q(v)\bigr).
$$
= Polarization identity
{wiki}
Over a field of characteristic other than two, a quadratic form recovers its symmetric bilinear form by
$$
B(u,v)=\frac12\bigl(Q(u+v)-Q(u)-Q(v)\bigr).
$$