Section Archimedes.
Context `{TnEQD:Tarski_neutral_dimensionless_with_decidable_point_equality}.

Lemma t22_23 :
~ hypothesis_of_obtuse_saccheri_quadrilaterals ->
forall A B C M N L,
~ Col A M N -> Per B C A -> A <> C -> Midpoint M A B ->
Per M N A -> Col A C N -> Midpoint M N L ->
Bet A N C /\ Le N C A N /\ Le L N B C.