Definitions
from The Century Dictionary.
- noun Any rational integral function, ϕ, of the letters a, b, c, …, which satisfies the partial differential equation (aDb + 2bDc + 3cDd + …) ϕ = 0.
Etymologies
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Examples
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A subinvariant series in which each subgroup is a normal subgroup of
Citizendium, the Citizens' Compendium - Recent changes [en] 2008
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