theorem :: PDIFF_5:78

for f being PartFunc of (REAL 3),REAL
for u0 being Element of REAL 3 st f is_hpartial_differentiable`13_in u0 holds
SVF1 (3,(pdiff1 (f,1)),u0) is_continuous_in (proj (3,3)) . u0 by Th21, PDIFF_4:33;