theorem Th40: :: CHORD:41

for G being _Graph
for S being non empty Subset of (the_Vertices_of G)
for H being inducedSubgraph of G,S
for W being Walk of H st W is minlength holds
for m, n being odd Nat st m + 2 < n & n <= len W holds
for e being object holds not e Joins W . m,W . n,G