Hi,
It looks like locally defined symbolic variables are always global, in
particular they overwrite globally defined variables of the same name:
sage: d = 0
sage: def f():
....: d = var('d')
....: d = 1
....:
sage: d
0
sage: f()
sage: d
d
(I put the d = 1 in the function definition to show the difference in
behaviour)
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