alt Hacker Newsi, j, k comes from FORTRAN's implicit types -- by default, names starting with I-N are integers and all other names are real.
i, j, k comes from FORTRAN's implicit types -- by default, names starting with I-N are integers and all other names are real.
this is much older ; Joseph Fourier was already using "i" and "j" for indices in the 1800s. See page 209: https://www.google.ca/books/edition/OEuvres_de_Fourier_Th%C3...