A relation among DS^{2}, TS^{2} and non-cylindrical ruled surfaces

摘要

$TS^{2}$isadifferentiablemanifoldofdimension4.Forevery$%XinTS^{2}$,ifweset$X=(p,x)$wehave$=0$since$ec{p}$isorthogonalto$T_{p}S^{2}$,therefore$parallelec{p}parallel=1$.Thosetherecouldexista...