Template for American Physical Society (APS) and American Institute of Physics (AIP) journals, including Physical Review Letters, Physical Review A-E, Physical Review X, Reviews of Modern Physics, Applied Phyiscs Letters, using the ReVTeX 4.2 document class.
This is the template for DAM (discrete and argumentative mathematics).
We prove theorem $2.1$ using the method of proof by way of contradiction. This theorem states that for any set $A$, that in fact the empty set is a subset of $A$, that is $\emptyset \subset A$.
stanley
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