Temperature Dependence of the Order Parameter of the Polar Phase of Liquid 3He in a Nematic Aerogel

It is proved that in the polar phase of superfluid(3)He stabilized by a nematic aerogel the temperature dependence of the gap in the spectrum of Fermi excitations must be the same as that in the bulk polar phase without foreign impurities when the liquid quasiparticles are specularly reflected from the aerogel strands. The analogy with the Anderson theorem for conventional superconductors is discussed.