This volume presents lively and engaging articles from the lecturers and the participants of the 25th and 26th Goekova Geometry-Topology Conferences, held on the shores of Goekova Bay, Turkey, in May/June of 2018 and May/June of 2019. The 25th and 26th Goekova Geometry-Topology Conferences were sponsored by the National Science Foundation, by the Turkish Mathematical Society, and by the European Research Council.

Lively and engaging articles from the lecturers and the participants of the 19th Goekova Geometry-Topology Conference, held on the shores of Goekova Bay, Turkey, in May of 2012.

The Goekova Geometry-Topology Conferences were inaugurated in 1992 with the support of TUBITAK (The Scientific and Technological Research Council of Turkey) and are held annually on the shores of the scenic Goekova Bay on the southwestern coast of Turkey. These conferences have been supported by TUBITAK since their inception and since 2005 they have received partial funding from NSF. Over the years the topics of these conferences were chosen from the exciting subjects of geometry and topology, usually with the most recent developments taking the front stage.

Lively and engaging articles from the lecturers and the participants of the 18th Goekova Geometry-Topology Conference, held on the shores of Goekova Bay, Turkey, in May of 2011.

Features the proceedings of the 14th Gokova Geometry-Topology Conference, held on the shores of Gokova Bay, Turkey, in May of 2007.

Features the proceedings of the 13th Gokova Geometry-Topology Conference, held on the shores of Gokova Bay, Turkey, in May of 2006.

Dedicated to the memory of Raoul Bott, a great mathematician of the 20th Century, this volume contains articles from both eleventh and twelfth Gokova Conferences, held in Gokova, Turkey.

Since its inception in 1992, the Gokova conference has been a premiere mathematics event sponsored by the Scientific and Technical Research Council of Turkey. The participants include distinguished mathematicians, who came from different parts of the world. This conference proceedings presents their inspiring talks and follow-up articles, which reflect the latest developments in Geometry and Topology. The proceedings of previous years, by the same editors, are also available.