Peace be upon you

I do not speak English well

I am a student at the Arab League

And doing research for harmonic analysis , But I had some problems in the search for some of the concepts

I hope that help me to find a summary of

1-hermitian operator.

2- L2(0.1) space .

3-Influential underweight.

4-Unitary equivalence.

5-Unitary group.

6-lattice

Thank you