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Notice: Trying to access array offset on value of type null in /var/www/html/wiki/includes/profiler/SectionProfiler.php on line 101 Edu talk:Relation - IAOA Wiki
The definitions above are my own (M Keet), as the sources consulted either had a formal definition alike in the database context, or informal hand waiving descriptions on having to do with 'between', rather than a neat definition that could be copied.
