Positive definite matrix
[计] 正定矩阵
🧩 词语组成解析
positive
['pɑzətɪv]
adj. 积极的;确实的，肯定的;[数]正的;[医]阳性的;
n. 正面;正片;[语]原级形容词;[数]正量;
posit肯定+ive形容词后缀 → 肯定的；积极的
🗣️ 情景例句
It really doesn't matter at all.
真的没关系。
It will take me several hours if I really look at everything.
如果全部参观的话，那得需要好几个小时。
'You should have declared that.
“你刚才应该申报，