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It depends. x and y are either elements or coordinates, a and b usually elements though in e.g. Haskell reserved (by convention) for type variables.
The ijkl series is reserved for indices. nm etc. are the counts of something, as such you’ll see i counting up to n. Both are due to mathematical sum notation and general mathematical convention. Random google result:
Let x1, x2, x3, …xn denote a set of n numbers. x1 is the first number in the set. xi represents the ith number in the set.
…if you’re using a language in which you use i often chances are you should stop coding in C and get yourself a language with iterators. Manual loops are a bug magnet.
It depends.
x
andy
are either elements or coordinates,a
andb
usually elements though in e.g. Haskell reserved (by convention) for type variables.The
i
j
k
l
series is reserved for indices.n
m
etc. are the counts of something, as such you’ll seei
counting up ton
. Both are due to mathematical sum notation and general mathematical convention. Random google result:…if you’re using a language in which you use
i
often chances are you should stop coding in C and get yourself a language with iterators. Manual loops are a bug magnet.