The texing of %e is OK but texing a constant of integration, %c, includes the %-symbol in the result. This is very inconvenient because of the special role of the %-symbol in LATEX. How can this be avoided? (C9) tex(%e); $$e$$ (D9) FALSE (C10) tex(%c); $$%C$$ (D10) FALSE Yours, Poul Riis Denmark