Discover Questions

Is the sum of 2 independent identically distributed Markov chains a Markov chain? Which moon phase has the Sun and Earth on the same side? If our Galaxy was at the center of the Universe wouldn't Hubble constant be plausible? A sodium-20 isotope has how many electrons? lim(n to inf) (1/√n)[1/√(n+1) + 1/√(n+2) + ... + 1/√(n+n)] = .?