Quick question about notation for normalisation

tomothy
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Just a quick question, I'm looking to express the normalisation condition formally mathematically, is this acceptable:

1=\int_R|\psi|^2 \ \mathrm{d}\tau

For a particle in 3 dimensional region R.
 
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Tau is rarely used to denote a volume integral, I think V or d^3r is a lot more standard. Tau is usually reserved for the proper time (or some characteristic time).
 
I think I've been using a textbook from about 18 years ago, so this could explain why. Thank you. (:
 
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