Quadripedia is an online encyclopedia dedicated to the global phase portraits of quadratic differential systems. It compiles and organizes the existing classifications published in the scientific literature, providing researchers with a comprehensive resource for locating known phase portraits and identifying opportunities for new discoveries.

Currently, Quadripedia contains more than one thousand topologically distinct phase portraits. It also highlights open problems, including the classification of phase portraits without limit cycles and many unresolved questions concerning systems with limit cycles.

The platform provides access to a searchable database and an interactive web system where phase portraits are presented in an encyclopedic format.

This is a work in progress. We are currently completing additional phase portraits, vector fields, and illustrations.

You can also go directly by the complete link: https://www.gsd.uab.cat/Quadripedia