# How can I typeset the operator as upright Roman font?

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
• Show your preamble if possible, which would help in troubleshooting. – Megadeth Jun 18 '15 at 5:08

So, just typing `\$\Delta\$` gives you an upright capital Greek Delta.
P.S. Note that there is a difference between `\$\Delta\$` and `\$\bigtriangleup\$`.