想請教大家兩題關於固態物理的問題:
1.第二題求出w之後 為什麼normal modes是(1,-2,1),(1,1,-2)和他們的線性組合?
不太了解normal modes的定義
2.第三題求出最後omega^2的特徵值和特徵向量後
為什麼normal modes是如圖所寫的所畫的那樣?
謝謝大家
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