Journal ask the operator \Delta is typeset in upright font. I try \operatorname{\Delta}, but it doesn't work and appears to have not use \operatorname. But if try \operatorname{d} it works.

  • Could you show us what it should look like? \Delta does not produce an slanted symbol. – Werner Jun 18 '15 at 4:45
  • I believe $\Delta$ gives an equilateral triangle that is upright, is not it? – Megadeth Jun 18 '15 at 4:54
  • Hi, @ Werner. I write it as $\Delta$ or in an equation environment. See tex.stackexchange.com/questions/18885/…, I want the upright \Delta without the arrow above. – Enter Jun 18 '15 at 4:57
  • Hi, @Chou. In my document, it looks italic. Please go to tex.stackexchange.com/questions/18885/…. What I want is the second one without arrow but what I got is the first one... – Enter Jun 18 '15 at 5:02
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    Show your preamble if possible, which would help in troubleshooting. – Megadeth Jun 18 '15 at 5:08

By default, plain TeX and LaTeX typeset the Greek capital letters in roman upright (following the established anglo-american tradition in mathematical typesetting).

So, just typing $\Delta$ gives you an upright capital Greek Delta.

You have to add some packages to change this behaviour. Comment out your packages until you have found the culprit.

P.S. Note that there is a difference between $\Delta$ and $\bigtriangleup$.

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