Possible Clues:

• The ore confused it gets, the more of a proposition it is
• The proposition might make the more of this
• Proposition involving old soldiers in the mass
• Proposition deducible from basic postulates
• Proposition from article covering raw material mined initially
• Geometric proposition
• There's something lacking refinement in them from Euclid
• Proposition others about mineral source
• Possibly more the sort of thing 16 across students deal with
• Pythagorean ___