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A species approach to Rota’s twelvefold way |
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| Institution: | Department of Physics, New York University, 4 Washington Place, New York, NY 10003, USA;Department of Mathematics, University College London, Gower Street, London WC1E 6BT, United Kingdom |
| Abstract: | An introduction to Joyal’s theory of combinatorial species is given and through it an alternative view of Rota’s twelvefold way emerges. |
| Keywords: | Combinatorial species Twelvefold way Functor Generating series Type generating series Cycle index series |
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