@InProceedings{kissinger_et_al:LIPIcs.CALCO.2015.171, author = {Kissinger, Aleks and Quick, David}, title = {{A First-order Logic for String Diagrams}}, booktitle = {6th Conference on Algebra and Coalgebra in Computer Science (CALCO 2015)}, pages = {171--189}, series = {Leibniz International Proceedings in Informatics (LIPIcs)}, ISBN = {978-3-939897-84-2}, ISSN = {1868-8969}, year = {2015}, volume = {35}, editor = {Moss, Lawrence S. and Sobocinski, Pawel}, publisher = {Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik}, address = {Dagstuhl, Germany}, URL = {https://drops.dagstuhl.de/entities/document/10.4230/LIPIcs.CALCO.2015.171}, URN = {urn:nbn:de:0030-drops-55335}, doi = {10.4230/LIPIcs.CALCO.2015.171}, annote = {Keywords: string diagrams, compact closed monoidal categories, abstract tensor systems, first-order logic} }