[isabelle] Degree of an almost everywhere constant function



Hi all,

in certain applications (most prominently polynomials) almost everywhere
constant functions nat => 'a play a critical role, and any almost
everywhere constant function can be assigned a degree, i. e. the highest
n such that for any higher n the function is constant.

Is there any stand-alone formalizsation of this concept?

Cheers,
	Florian

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