  We present Veech's proof of Sarnak's theorem on the M\"{o}bius flow which say
that there is a unique admissible measure on the M\"{o}bius flow. As a
consequence, we obtain that Sarnak's conjecture is equivalent to Chowla
conjecture with the help of Tao's logarithmic Theorem which assert that the
logarithmic Sarnak conjecture is equivalent to logaritmic Chowla conjecture,
furthermore, if the even logarithmic Sarnak's conjecture is true then there is
a subsequence with logarithmic density one along which Chowla conjecture holds,
that is, the M\"{o}bius function is quasi-generic.
