(adsbygoogle = window.adsbygoogle || []).push({}); what's "V-representable"

Just encountered this word, not sure what it means. I tried google and wiki, but didn't find any introductory articles, only some professional articles which mentioned this word.

Can someone introduce a bit?

P.S. I'm not even sure where to post question, for I haven't figured out whether it's more mathematical or physical, so I put it here, randomly.

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# What's V-representable

**Physics Forums | Science Articles, Homework Help, Discussion**