I know that for exponential functions $e^{at}$, or functions like $1/t^m$, t>0, both they and their reciprocals are smooth. Could you please give me more classes of smooth functions, or Analytic class that could meet this requirement?
Thanks. Shuxia
2026-03-26 18:49:44.1774550984
About smooth function whose reciprocal is also smooth
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