|Description: Derivation of set.mm's
original ax-11o 1654 from the shorter ax-11 1389 that
has replaced it.
An open problem is whether this theorem can be proved without relying on
ax-16 1644 or ax-17 1402.
Another open problem is whether this theorem can be proved without
relying on ax-12 1393 (see note in a12study 1825).
Theorem ax11 1655 shows the reverse derivation of ax-11 1389 from ax-11o 1654.
Normally, ax11o 1653 should be used rather than ax-11o 1654, except by
theorems specifically studying the latter's