Define Matrix



### Define Matrix Notion
|Title|
|:-:|
|[Positive Definite](https://texonom.com/positive-definite-ecaeb51005c0411a8f515f5eb8612c6d)|
|[Positive semi-definite](https://texonom.com/positive-semi-definite-402fa18c1ec74c7a80caba4b1c95cc3d)|







