from The Century Dictionary.
- noun A series which proceeds according to the ascending positive integral powers of a variable. Thus the series a0 +
a1x + a2x + … + anx + … whose coefficients a are independent of x, is a power-series or integral series in x.
Sorry, no etymologies found.
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One can remove them by normal ordering at each order of a power-series expansion in the coupling, but this still seems like a cheat.
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