Gabriel's horn is a solid of revolution that has a finite volume but an infinite surface area.pic.twitter.com/p9xYUpvJ2B
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That's why we need experiment. In QFT we prevent this via the process of renormalizatoin.
When you deal with many unobservables, there are many competing theories that generate same experimental results (data underdetermination issue). Therefore experiment is not sufficient.
Okay fair, there are principles one also needs to take up. Such as uniqueness, ad-hoc-ness, etc.
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