Table of Contents - 20.25.2. Obsolete schemes ax-c4,c5,c7,c10,c11,c11n,c15,c9,c14,c16
These older axiom schemes are obsolete and should not be used outside of this
section. They are proved above as theorems axc4 , sp, axc7, axc10,
axc11, axc11n, axc15, axc9, axc14, and axc16.