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This is the first of two papers aiming to describe the use of the facilities of the package Xy-pic for constructing commutative diagrams. We tried to use in a systematic way the ``learning by examples'' approach, without entering into the details of different constructions or trying to describe in an exhaustive way all the possibilities. The final goal is to provide the reader with enough knowledge to be able to construct by himself complicated diagrams. This first paper describes the basic possibilities of Xy-pic, which are provided by the kernel of the associated language, but it also explores many of the opportunities provided by the extension arrow.

Paul Blaga is an Assistant Professor of Geometry at the Faculty of Mathematics and Computer Sciences of the "Babes-Bolyai" University in Cluj-Napoca, Romania. He started using LaTeX in the early 1990's. Initially, his interest was just for writing scientific papers, but afterwards he became more and more involved and gradually turned into a great LaTeX fan. He has served several years as an editor of the mathematical journal Studia Universitatis Napocensis, Mathematica and was responsible for switching it to LaTeX in the late 1990's. He is also the co-author of a book on LaTeX. His main interests in LaTeX are related, especially, to the graphical capabilities -- not only commutative diagrams, but also more complicated drawings, made, for instance, with Pstricks. You can reach Paul at

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