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Re: What is f[1]? Advanced question


Thanks. This is very helpful. I remain puzzled by this:

u // FullForm
FullForm[Symbol["u"]]
FullForm[Unevaluated[Symbol["u"]]
Head[u]

FullForm[{1, 2, 3}]
Head[{1, 2, 3}]

In other words, Head and FullForm seem consist for the list, and inconsistent for the variable u. u's full form is just, literally "u", not Symbol["u"]. But the list's FullForm starts with "List". Head of Symbol["u"] is not Symbol, but "u". What gives?




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