> What is mpz_combit, mentioned at http://www.swox.com/gmp/gmp4.2.html ? I can't find it in the online manual. > Keith It seems indeed to be a bug (that it is not in the manual). The source manual says: % grep mpz_combit *.c combit.c:/* mpz_combit -- complement a specified bit. combit.c:mpz_combit (mpz_ptr d, unsigned long int bit_index) Paul