ROSAT : The Roentgen Satellite https://heasarc.gsfc.nasa.gov/docs/rosat/rosat.html Lifetime : 1 June 1990 - 12 February 1999 Energy Range : X-ray 0.1 - 2.5 keV , EUV 62-206 eV Special Feature : All sky-survey in the soft X-ray band Payload : An X- ...
diffeomorphism 微分同胚 https://en.wikipedia.org/wiki/Diffeomorphism http://mathworld.wolfram.com/Diffeomorphism.html A diffeomorphism is a map between manifolds which is differentiable and has a differentiable inverse. ---------------------------------------------------------------- ...