Nonlinear Di erential Approximants
نویسنده
چکیده
This paper concerns a new type of approximant for series analysis. By incorporating linear recurrence techniques, such as are involved with second order di erential approximants, algebraic approximants can be extended to nonlinear di erential approximants. The discussion of nonlinearities is constrained by discussing approximants just one step removed from second order algebraic approximants. The technique we use is highly suggestive, and points toward modifying the renormalization group theory by the use of multifunctions.
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