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The English language uses "articles". This gaffe was not AK's fault, but came from JimJast. Which means I'm going to have to go over this page in detail. Sigh.
'''Cosmological constant''' is constant <math>\Lambda</math> of Einstein field equation
The '''Cosmological constant''' is the constant <math>\Lambda</math> of Einstein field equation
:<math>R_{\mu\nu}-(R/2)g_{\mu\nu}+\Lambda g_{\mu\nu}=8\pi T_{\mu\nu}</math>,
:<math>R_{\mu\nu}-(R/2)g_{\mu\nu}+\Lambda g_{\mu\nu}=8\pi T_{\mu\nu}</math>,
where <math>R_{\mu\nu}</math> is Ricci tensor, <math>R</math> is its contraction, <math>g_{\mu\nu}</math> is metric tensor of spacetime, and <math>T_{\mu\nu}</math> is stress-energy tensor.
where <math>R_{\mu\nu}</math> is Ricci tensor, <math>R</math> is its contraction, <math>g_{\mu\nu}</math> is metric tensor of spacetime, and <math>T_{\mu\nu}</math> is stress-energy tensor.