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Siddharthist (talk | contribs) Ask about open subsets in the ___domain |
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A physical example would be the [[Bloch wave]]. [[user:Maschen|'''M∧''Ŝ''''']][[special:contributions/Maschen|''c''<sup>2</sup>''ħ''ε]][[user talk:maschen|''И<sub>τlk</sub>'']] 13:33, 8 July 2013 (UTC)
== "Supposed supposed to contain an open subset of ℝ<sup>''n''</sup>"? ==
The end of the lead section says that the ___domain of a function of several real variables is "supposed to contain an [[Open set|open]] subset of ℝ<sup>''n''</sup>". I understand why the ___domain of some kind of ''sensible'' functions might contain an open subset, but the following is a perfectly valid function of several real variables: <math>f:\{(0,0)\}\to \{\emptyset\}</math> where <math>f(0,0)=\emptyset</math>. Could someone add a citation or clarify the language? Thanks, and sorry if I'm misunderstanding! [[User:Siddharthist|siddharthist]] ([[User talk:Siddharthist|talk]]) 21:14, 23 November 2017 (UTC)
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