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, 16:46, 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, <math>~E~</math> cannot qualify as either a pre-function or a function on either of its relational domains. | + | 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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| ===Commentary Note 11.6=== | | ===Commentary Note 11.6=== |