Description: Stoic logic Thema 3. Statement T3 of Bobzien p. 116-117 discusses
Stoic logic Thema 3. "When from two (assemblies) a third follows, and
from the one that follows (i.e., the third) together with another,
external assumption, another follows, then that other follows from the
first two and the externally co-assumed one. (Simp. Cael. 237.2-4)"
(Contributed by David A. Wheeler, 17-Feb-2019)