Man pages matching name mpi_cart_rank in section 3:

MPI_Cart_rank.3.en	debian 10 / lam-mpidoc
MPI_Cart_rank.3.en	debian 10 / mpich-doc
MPI_Cart_rank.3.en	debian 11 / lam-mpidoc
MPI_Cart_rank.3.en	debian 12 / lam-mpidoc
MPI_Cart_rank.3.en	debian 12 / mpich-doc