My first thought is that it is not April 1st yet. My next thought was well Math is a very pure language of God. But nope, drawing a blank as to why this is a promo item on Logos' Facebook page.
Contemporary Abstract Algebra, 10th ed. (Textbooks in Mathematics) | Logos Bible Software
Interesting - it even indicates it is a Logos Research Edition - doesn't that mean extra tagging? I'm bemused and curious. :)