🏆Check out my courses on Udemy😎🥇:
🟢1 Day Mathematica
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🟢Introduction to Cosmology
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In this course, we cover all the important ideas such as Newtonian Cosmology, Relativistic Cosmology, Redshift, FLRW metric, scale factor, Hubble parameter, Hubble law, and Friedmann equations.

FLRW metric is a result of work done by Alexander Friedmann, Georges Lemaitre, Howard P. Robertson and Arthur Geoffrey Walker. It represents an expanding universe with a general curvature. There's a parameter " k " which defines the curvature of spacetime as follows:
k = 0 : Flat spacetime
k is positive: Positively curved spacetime
k is negative: Negatively curved spacetime

Also, don't forget to check out the official APA website:
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