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In physics, extra dimensions are proposed additional space or time dimensions beyond the (3 + 1) typical of observed spacetime, such as the first attempts based on the Kaluza–Klein theory. Among theories proposing extra dimensions are:
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| Subject | Predicate | Object | Confidence | Src |
|---|---|---|---|---|
| Extra dimensions | related to External links | Wiktionary-logo-en-v2 | 0.60 | section |
| Extra dimensions | related to External links | Quotations | 0.60 | section |
| Extra dimensions | related to External links | Extra | 0.60 | section |
| Extra dimensions | related to External links | Wikiquote | 0.60 | section |
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