Math 2.0

Concept

Second order

Summary

The second order logic of graphs is a form of logic in which variables may represent vertices, edges, sets of vertices, and (sometimes) sets of edges. This logic includes predicates for testing whether a vertex and edge are incident, as well as whether a vertex or edge belongs to a set. To be distinguished from first order logic, in which variables can only represent vertices.

Further reading

  1. Wikipedia, page 325802, revision 1373839425, Glossary of graph theory, section S. adopted
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