In [1]:
M = Manifold(2,"M")
In [2]:
U = M.open_subset('U')
In [3]:
V = U.open_subset('V')
In [4]:
a = M.vector_field()
In [5]:
aU = a.restrict(U) # inverting these 2 lines yields "False" in the next cell
aV = a.restrict(V)
In [6]:
aU.restrict(V) is aV
Out[6]:
True