&invZ) return v } // (Re)addition and subtraction. // Add sets v = p + q, and returns v. func (v *Point) Add(p, q *Point) *Point { checkInitialized(p, q) qCached := new(projCached).FromP3(q) result := new(projP1xP1).Add(p, qCached) return v.fromP1xP1(result) } // Subtract sets v = p - q, and returns v. func (v *Point) Subtract(p, q *Point) *Point { checkInitialized(p, q) qCached := new(projCached).FromP3(q) result := new(projP1xP1).Sub(p, qCached) return v.fromP1xP1(result) } func (v *projP1xP1)...