theorem Th73: :: FACIRC_1:73

for x, y, c being object holds
( [<*x,y*>,'&'] in InnerVertices (MajorityStr (x,y,c)) & [<*y,c*>,'&'] in InnerVertices (MajorityStr (x,y,c)) & [<*c,x*>,'&'] in InnerVertices (MajorityStr (x,y,c)) )