MyWikiBiz, Author Your Legacy — Tuesday November 04, 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.  | + | Clearly, then, the relation <math>~E~</math> cannot qualify as a pre-function, much less as a function on either of its relational domains.  | 
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|   | ===Commentary Note 11.6===  |   | ===Commentary Note 11.6===  |