MyWikiBiz, Author Your Legacy — Tuesday April 08, 2025
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, 16:48, 12 April 2009
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Also, <math>~E~</math> is not tubular at either <math>~X~</math> or <math>~Y,~</math> since there are nodes in both <math>~X~</math> and <math>~Y~</math> having incidence degrees greater than 1.
Also, <math>~E~</math> is not tubular at either <math>~X~</math> or <math>~Y,~</math> since there are nodes in both <math>~X~</math> and <math>~Y~</math> having incidence degrees greater than 1.
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Clearly, then, the relation <math>~E~</math> cannot qualify as a pre-function, much less as function on either of its relational domains.
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Clearly, then, the relation <math>~E~</math> cannot qualify as a pre-function, much less as a function on either of its relational domains.
===Commentary Note 11.6===
===Commentary Note 11.6===