Johnson, Fred (Frederick A.), authorDuke University Press, publisher2019-10-232019-10-231992Johnson, Fred. Counting functions. Notre Dame J. Formal Logic 33 (1992), no. 4, 567--568. https://doi.org/10.1305/ndjfl/1093634488. https://projecteuclid.org/euclid.ndjfl/1093634488https://hdl.handle.net/10217/198387Counting functions are shown to be closed under composition.born digitalarticlesengCopyright and other restrictions may apply. User is responsible for compliance with all applicable laws. For information about copyright law, please see https://libguides.colostate.edu/copyright.boolean functionsboolean algebrasTexthttps://doi.org/10.1305/ndjfl/1093634488