theorem Th10: :: PDIFF_6:10

for m, n being non zero Nat
for f being PartFunc of (REAL m),(REAL n)
for x being Element of REAL m st f is_differentiable_in x holds
diff (f,x) is Point of (R_NormSpace_of_BoundedLinearOperators ((REAL-NS m),(REAL-NS n)))