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Re: What is f[1]? Advanced question

  • To: mathgroup at smc.vnet.net
  • Subject: [mg131317] Re: What is f[1]? Advanced question
  • From: amannucci <Anthony.J.Mannucci at jpl.nasa.gov>
  • Date: Thu, 27 Jun 2013 06:33:15 -0400 (EDT)
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  • References: <20130626011408.DC7E86A2B@smc.vnet.net> <kqdshl$n34$1@smc.vnet.net>

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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