Dear fellow category theorists, It is my pleasure to announce the complete online publication of the Special Issue in honor of Professors Peter J. Freyd and F. William Lawvere on the occasion of their 80th birthdays. Tbilisi Mathematical Journal 10-3 (June 2017) pp. 1-328. Lead Editor: Marta Bunge Guest Editors: Andrej Bauer, Peter T. Johnstone, Anders Kock, Colin McLarty, Susan Niefield, Andrew M. Pitts, John Power, Giuseppe Rosiolini, Ross Street, Thomas Streicher, Walter Tholen and David Yetter. Table of Contents. 0. Marta Bunge, Introduction : A personal Tribute to Peter Freyd and Bill Lawvere. 1. Ross Street, Wreaths, Mixed wreaths and Twisted Coactions. 2. George Janelidze/ Ross Street, Real Sets. 3. Michael Barr, Topological *-Autonomous Categories, revisited. 4. Anders Kock, Bundle Functors and Fibrations. 5. Christopher Townsend, Hilsum-Skandalis Maps as Frobenius Adjunctions with Applications to Geometric Morphisms. 6. Giulia Frosoni/ Giuseppe Rosolini, Equilogical Spaces and Algebras for as Double-Power Monad. 7. Maria Emilia Maietti/ Fabio Pasquali/ Giuseppe Rosolini, Triposes, Exact Completions and Hilbert's epsilon-Operator. 8. Andrej Bauer, On Fixed-Point Theorems in Synthetic Computability. 9. Matias Menni, The Construction of pi-0 in Axiomatic Cohesion. 10. Peter T. Johnstone, Fuhctoriality of Modified Realizability. 11. Walter Tholen, Quantalic Topological Theories. 12. Thomas Cottrell/ Soichiro Fujii/ John Power, Enriched and Internal Categories : An Extensive Relationship. 13. Clemens Berger/ Ralph M. Kauffmann, Comprehensive Factorizations. 14. Jiri Adamek/ Jiri Rosicky, Algebra and Local Presentability : How Algebraic Are They? (A Survey). 15. Marcelo Fiore, On the Concrete Representation of Discrete Abstract Clones. With best wishes, Marta Bunge Emeritus Professor Department of Mathematics and Statistics McGill University Burnside Hall 805 Sherbrook Street West Montreal, QC, Canada H3A 0B9 bunge@math.mcgill.ca [For admin and other information see: http://www.mta.ca/~cat-dist/ ]