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    $\begingroup$ "Another option would have been to have Mathematica "know" what was a variable and what was a function. This turns out to have serious consequences, and it's really not a good idea." Can someone elaborate on this? $\endgroup$ Commented Jun 12, 2018 at 8:16
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    $\begingroup$ @daniatic In countPos[list_, a_, k_] := Total@Table[Boole[Positive[k(x - a)]], {x, list}], is k a function or a scalar? It depends on what I, the user, have in mind, which cannot be determined from the code. $\endgroup$ Commented Aug 11, 2019 at 22:06
  • $\begingroup$ "If you use one of the variations you suggested above, Mathematica will warn you that you are probably making a mistake." -- not sure about that (see some of the questions that arise here every day) $\endgroup$ Commented Jan 18, 2021 at 3:11
  • $\begingroup$ @Chris, I haven't looked at 2.2 (the version they were using when that book was written) in a long while to prove or disprove that, but I do agree we still get a lot of those basic syntax questions every so often... o well. $\endgroup$ Commented Jan 18, 2021 at 3:21