(23.06) I’m happy to announce that 3 authors have agreed about publishing a joint new version of the problem No.26. See problem No.26.1 by Petko A.Petkov (Bulgaria), S.K. Balasubramanian (India) & Pierre Tritten (France) on PAGE-8. (yesterday, 22-Jun, 2 joint versions were announced – A & B. But now the authors have came to this one) Thanks a lot to the authors!
All articles by Petko A.Petkov published at the site are available from the Articles page.