Jonathan David Farley Department of Mathematics, Morgan State University, 1700 E. Cold Spring Lane, Baltimore, MD 21251, United States of America

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Problem 2 of Welsh’s 1976 text Matroid Theory, asking for criteria telling when two families of sets have a common transversal, is solved.

Another unsolved problem in the text Matroid Theory, on whether the “join” of two non-decreasing submodular functions is submodular, is answered in the negative. This resolves an issue first raised by Pym and Perfect in 1970.

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    Barnard, A. D. Obituary: Aubrey William Ingleton (1920–2000). Bulletin of the London Mathematical Society, 36 (2004), 119129.

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    Brualdi, R. A. Common Transversals and Strong Exchange Systems. Journal of Combinatorial Theory, 8 (1970), 307329.

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    Milner, E. C. Independent Transversals for Countable Set Systems. Journal of Combinatorial Theory (A), 19 (1975), 125133.

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    Mirsky, L. Transversal Theory: An Account of Some Aspects of Combinatorial Mathematics. Academic Press, New York City, 1971.

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    Mathematical Reviews MR0427112 (55 #148).

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    Oxley, J. The Contributions of Dominic Welsh to Matroid Theory. In Geo_rey Grimmett and Colin McDiarmid (eds.), Combinatorics, Complexity, and Chance. A Tribute to Dominic Welsh. Oxford University Press, Oxford, 2007, 234259.

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    Perfect, H. Remark on a Criterion for Common Transversals. Glasgow Mathematical Journal, 10 (1969), 6667.

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    Steffens, K. Ergebnisse aus der Transversalentheorie. II. Journal of Combinatorial Theory (A), 20 (1976), 202229.

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    University of Waterloo, Citation for Dominic Welsh (2006).

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    Welsh, D. J. A. Matroid Theory. Academic Press, Inc., New York City, 1976.

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