線代聖經本的定理6.20說
如果A是n階實矩陣，則
A is symmetric <=> A is orthogonally equivalent to a real diagonal matrix.
可是我前幾天遇到一個矩陣:
3 5 0
5 1 9
0 9 0
它明明是個對稱實矩陣，但它的eigenvalues卻是...
http://0rz.tw/anyd0
都不是實數啊！！！
請問這是怎麼回事呢？(覺得困惑)
拜託鄉民們幫忙解答，謝謝！
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