The integration you are trying to compute will not give you any answer because the constant 'sigma v' has a subscript v which is considered as a variable v which runs from (-) Infinity to (+) Infinity. As Mathematica does not know that it is a subscript or a notation,it can not compute. That is why it is convenient to use another symbol say, 'a' instead of 'sigma v'.

Integrate[Exp[(-v^2/a^2)/2]/(Sqrt[2 Pi] a), {v, -Infinity, Infinity}]

Perhaps this will work. See the attachment.

Attachments:

Sorry Suvadip, You had answered while I was creating a response.

Hi Craig,

Please do not mind.

sincerely, Suvadip.

Thanks. Palm slap to forehead.... I saw that it had moved the following day. I would have never survived in the wild.

I am wondering if that icon needs some words above or beside it, such as "Use this for Posting Code"? I don't find <> is obvious for its purpose.