7. For vectors \( ^{v} \) and \( ^{w} \) in an inner product space \( \langle \cdot, \cdot \rangle \). Prove that \( \langle v-w, v+w \rangle = 0 \) if and only if \( \langle v,v \rangle = \langle w,w \rangle \) (15分)

相關申論題

相關試卷