[제 2회] Isometry as restriction of imaginary matrix

jryoungw 0 1778 0 0 2022.05.12 09:38

![스크린샷 2022-05-12 오전 9.37.50.png](https://freshrimpsushi.com/community/data/editor/2205/1890168101_1652315910.0162.png "스크린샷 2022-05-12 오전 9.37.50.png")

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