"IV" wrote in news:firstname.lastname@example.org... > what is meant by expressions like ln, arcsin, ^(1/n), a^ in equations of > complex unknowns if no further information about this is given? Are this > only the principal branches, or are the whole elementary complex > "functions" (Multifunctions) meant? Is there a general binding convention > for this? I understood: There is no general convention. He has to define which branches he means. Thank you all.