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The question of why space is three dimensional has a long history, going back to Kant and Ehrenfest. For an excellent overview see Barrow & Tipler's The Anthropic Cosmological Principle (1986) which also discusses how this fits with the weak anthropic principle: the laws of nature (or properties like dimensionality) needs to allow observers to exist. A ...


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Using the anthropic principle, we can effectively "determine" that a 3D world is most suitable for life and other objects in the universe. 0-dimensional universe The universe is just a point, and nothing really exists. It's just a singularity. 1-dimensional universe The universe's objects are line segments. The space between them are also empty ...


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