domain = Circle(Point(0, 0), 0.5)

mesh_h = 64

mesh = generate_mesh(domain, mesh_h)

V = FunctionSpace(mesh, ‘P’, 1) # P1有限元

P1 = FiniteElement(‘P’, triangle, 1)

element = MixedElement([P1, P1, P1])

V_t = FunctionSpace(mesh, element)

u = Function(V_t)

u_1, u_2, u_3 = u.split

_u = Function(V)

Does the structrue of _u equal wiht u_1?