Select committees can launch inquiries into any relevant topic of their choosing and ask any potential witnesses who could assist to appear before them.

For example, showing reading around the subject or your own opinions about currently expressed thinking on a relevant topic.

I needed to speak out when it's a very socially relevant topic.

This material has been focused into concise, relevant topic areas and grouped by discipline.

Both works contain many identities concerning specific integrals, which are organized with the most relevant topic instead of being collected into a separate table.