The horizon and flatness problems had been recognized since the 1960s, but were rarely discussed—simply because no one had any idea as to what to do about them.
CITATION STYLE
Perlov, D., & Vilenkin, A. (2017). The Theory of Cosmic Inflation. In Cosmology for the Curious (pp. 235–253). Springer International Publishing. https://doi.org/10.1007/978-3-319-57040-2_16
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