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The cosmological parameters from supernovae 1

Supernovae are bright luminous stellar objects observable up to red-shifts close to z ∼ 1. They are used to probe the geometry of the Universe and its expansion rate by applying different methods. In this text, I review the various approaches used to measure the present expansion rate of the Universe, H 0 , and the paths to determine its matter density Ω M and the possible contribution of a non–zero cosmological constant Λ. An account is given of the numerical estimates of those cosmological parameters according to the present status of the research.