theorem Th10: :: JORDAN12:10

for f, g being FinSequence of (TOP-REAL 2) holds INTERSECTION ( { (LSeg (f,i)) where i is Nat : ( 1 <= i & i + 1 <= len f ) } , { (LSeg (g,j)) where j is Nat : ( 1 <= j & j + 1 <= len g ) } ) is finite