theorem Th7: :: NDIFF_2:7

for S, T being RealNormSpace
for R being RestFunc of S,T st R /. (0. S) = 0. T holds
for e being Real st e > 0 holds
ex d being Real st
( d > 0 & ( for h being Point of S st ||.h.|| < d holds
||.(R /. h).|| <= e * ||.h.|| ) )