ProofWiki

Trigger: !proofwiki

Try it

Kagi would openhttps://proofwiki.org/w/index.php?title=Special:Search&search=linear+algebra

Run !proofwiki in Kagi

URL pattern: https://proofwiki.org/w/index.php?title=Special:Search&search=query

Searches proofwiki.org, filed under Learning.

Other bangs for proofwiki.org

Proof Wiki !proof