symmetrical matrix的用法和樣例：
例句
- If a symmetrical matrix is positive definite, the determinants of all its minors are also positive.
如果對稱矩陣是為正定者，它的所有子式的行列式也都是正的。 - We extend Hua's fundamental theorems of the geometry of self-adjoint matrices and symmetric matrices to the infinite-dimensional case.
摘要本文分別將華氏自伴矩陣幾何與對稱矩陣幾何基本定理推廣到無限維的情形。
