's saying here
unless you trouble to add after each "proposition" "-al expression".

&gt; This is one of my inspirations for the definition of "proposition" as
&gt; an equivalence class of sentences that are said to have "the same meaning".

Sure, I recognize the sign up ahead, and I see the zone
that it betides, but you have just crossed over into that
other way of talking about propositions, not as sentences,
as before you crossed the line, but now as those abstract
twilight entities called equibbling cla