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Astronomy and Cosmology
Cosmology
Age of Universe: Big Bang, Braneworlds & Perspective
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[QUOTE="jbriggs444, post: 6827239, member: 422467"] [emphasis mine] There are various speculations for what happened earlier than what we have good evidence for. Some of those speculations have a history covering a finite range of times. Others have a history covering an infinite range of times (e.g. the "Big Bounce"). Either way, the intervals covered are "open". This is "open" in the mathematical sense like the open interval ##(0, \infty)## or the open interval ##(-\infty, +\infty)##. Either way, there is no first instant of time. Nor any creation event. But one way the history of the universe is finite into the past and the other way the history of the universe is infinite into the past. We like describing things with "[URL='https://en.wikipedia.org/wiki/Manifold']manifolds[/URL]". Manifolds are built with with "[URL='https://en.wikipedia.org/wiki/Open_set']open[/URL]" sets. [/QUOTE]
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Astronomy and Cosmology
Cosmology
Age of Universe: Big Bang, Braneworlds & Perspective
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