adjective Mathematics.
of or pertaining to an extremum or the calculation of extrema: an extremal problem.

1400–50; late Middle English. See extrem(um), -al1

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World English Dictionary
extremal (ɪkˈstriːməl)
maths, logic the clause in a recursive definition that specifies that no items other than those generated by the stated rules fall within the definition, as in 1 is an integer, if n is an integer so is n+1, and nothing else is

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Example sentences
The second is an improved technique for varying time extremal ship tracks toward admissibility.
More specifically, it is a set of tools and techniques for bounding extremal eigenvalues.
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