theorem Th112: :: EUCLIDLP:112

for n being Nat
for L, L0, L1, L2 being Element of line_of_REAL n
for P being Element of plane_of_REAL n st L0 c= P & L1 c= P & L2 c= P & L0 // L1 & L1 // L2 & L0 <> L1 & L meets L0 & L meets L1 holds
L meets L2