Eigenvalue


Each eigenvalue $\lambda$ is associated with a specific eigenvector $\vec{x}$ for A
$$A\vec{x} = \lambda\vec{x}$$
Eigenvalue show how much eigenvector change to the direction
eigenvalue가 작을수록 역행렬의 크기는 커짐 (eigenvalue 역수관계)
그러나 eigenvalue가 0에 가까울수록 역행렬의 크기는 매우 커지므로, 계산적으로 불안정
![https://github.com/kenjihiranabe/The-Art-of-Linear-Algebra](https://www.notion.so/image/https%3A%2F%2Fs3-us-west-2.amazonaws.com%2Fsecure.notion-static.com%2F2da05dc6-46f2-4e21-88e4-2e3e78270107%2FUntitled.png?table=block&id=4cb6597d-5575-44fa-a585-733e77417184&cache=v2)




> [고윳값과 고유벡터](https://angeloyeo.github.io/2019/07/17/eigen_vector.html)





