Some Markdown Grammer Issues

❌: \left{ \right}
✅: \set{ }

❌: \
✅: \newline

❌: ^*
✅: ^{*}

❌: -
✅: _

❌: |
✅: \Vert
(Note that one need to add a blackspace after \Vert when globally changing all of | because otherwise for example |a| will be changed to |Verta\vert, which is invalid.)

❌: \epsilon
✅: \varepsilon