About "tg" vs "tan": for a while, "tg", "cotg", and "cosec" were used. Then the academic community switched to "tan", "cot", and "csc" but the high school trigonometry textbooks remained with "tg" and family. After a while, the high school textbooks also switched. Now the common form used in all levels of education is "tan" and family.
About the stretched limit: High schools used that Persian stretched limit (Heh, Dal) when I was in high school, but the official textbooks now use the Latin "lim" (I just confirmed this with a high school student who checked with his textbook). The academic community have often used "lim". Roozbeh _______________________________________________ PersianComputing mailing list PersianComputing@lists.sharif.edu http://lists.sharif.edu/mailman/listinfo/persiancomputing