Defining a symbolic function seems to declare its arguments. Case
illustrated in this sagecell example
<https://sagecell.sagemath.org/?z=eJwrSi1OLdHQ5OXyTDG0BTGLM_LL4zNTUvNKMtMyU4uKNTSBkmn5-RoFOok6SZq2BXEaibqGmloahroFmnEaSUA2SLMRbs1ASQVdBaD5ACSeIG0=&lang=sage&interacts=eJyLjgUAARUAuQ==>
:
reset()
Id1=set(show_identifiers())
foo(p,a,b)=p^(a-1)*(1-p)^(b-1)
Id2=set(show_identifiers())
Id2 - Id1
which happily prints :
{'Id1', 'a', 'b', 'foo', 'p'}
Is this expected ?
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