Blood types form a topological space (and a complete distributive lattice). There are three generators: **A**, **B**, and **Rh+**.

Above the “zero element” is the universal donor **O−** and the “unit element” is the universal receiver **AB+**.

A **topological space** contains a zero object, maybe other objects, and all unions **∪** & intersections **∩** of anything in the space. So taking the power set **℘** of **{A, B, +}** yields the “power set topology” which I drew above. **AB+** is the **1** object and “nullset” **O−** is the **0** object.

A **lattice** has joins **∨** & meets **∧** which function like **∪** and **∩** in a topological space. Like **1** or **True** in a Heyting algebra, blood type as a power-set topology has one “master” object **AB+**.

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