Additional Help with Order Isomorphisms

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The discussion centers on the search for online resources similar to Paul's Online Notes specifically for abstract algebra, focusing on set theory and functions. A key concern is finding comprehensive materials on isomorphisms of posets, including proofs of relevant theorems. The user expresses difficulty with the topic and seeks additional practice beyond their textbook. They mention discovering ProofWiki but found it lacking in content. The conversation invites recommendations for larger databases or websites that offer extensive proofs and resources for studying isomorphisms in posets.
PCSL
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I'm curious if there is a site like Paul's Online Notes for abstract algebra classes on set theory, functions, etc.

Lately I've been having trouble with isomorphisms of posets, so if there is a resource where I could view some proofs of theorems relating to isomorphisms of posets that would be awesome.

Thanks for any help you can offer, my textbook is fine - I'd just like some more practice.
 
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I found a site called proofwiki but it did not have many proofs (seemed like it was a startup). Maybe you guys know of some larger databases of proofs?
 
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