Logical matrix (English Wikipedia)

Analysis of information sources in references of the Wikipedia article "Logical matrix" in English language version.

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O'Neil, Patrick E.; O'Neil, Elizabeth J. (1973). "A Fast Expected Time Algorithm for Boolean Matrix Multiplication and Transitive Closure". Information and Control. 22 (2): 132–8. doi:10.1016/s0019-9958(73)90228-3. — The algorithm relies on addition being idempotent, cf. p.134 (bottom).
Schmidt, Gunther (2013). "6: Relations and Vectors". Relational Mathematics. Cambridge University Press. p. 91. doi:10.1017/CBO9780511778810. ISBN 978-0-511-77881-0.
E.g., see Beth, Thomas; Jungnickel, Dieter; Lenz, Hanfried (1999). "I. Examples and basic definitions". Design Theory. Encyclopedia of Mathematics and its Applications. Vol. 69 (2nd ed.). Cambridge University Press. p. 18. doi:10.1017/CBO9780511549533.001. ISBN 978-0-521-44432-3.

Copilowish, Irving (December 1948). "Matrix development of the calculus of relations". Journal of Symbolic Logic. 13 (4): 193–203. JSTOR 2267134.