to create two versions of the elements
&gt;     of this common corpus nor to
&gt;
&gt; b)  use a quantifier on all of the common corpus.
&gt; 
&gt; 2a.  The law of the conservation of momentum in an
&gt;      inertial (non-accelerated) frame of reference.
&gt; 
&gt; 2b.  The lack of conervation of momentum stated with
&gt;      respect to a non-inertial frame of reference.

Again, physics is prolific source of many suggestive analogies --
we can get a lot of mileage by cranking the chiasmatic commutator
or 