Mathematica Asked by Daniel Asimov on July 10, 2021
What’s the most straightforward way to ask Mathematica to find all solutions of an equation like
$$3x + 2y + 4z = 0 pmod {11}$$
(for instance), where either $x$, $y$, $z$ can be considered to be integers in the range $-5dots 5$,
or equivalently they belong to the ring $Z/(11Z)$ of integers modulo $11$?
(I’ve tried a number of obvious things with no success.)
Solve[Mod[3 x + 2 y + 4 z, 11] == 0 &&
-5 <= x <= 5 && -5 <= y <= 5 && -5 <= z <= 5, Integers]
(* {{x -> -5, y -> -5, z -> -2},
{x -> -5, y -> -4, z -> 3},
{x -> -5, y -> -3, z -> -3},
...
{x -> 5, y -> 5, z -> 2}} *)
(121 solutions)
Correct answer by Roman on July 10, 2021
Solve[3 x + 2 y + 4 z == 0, Modulus -> 11]
produces {{z -> 2 x + 5 y}}
(as residue classes modulo 11).
Answered by Greg Martin on July 10, 2021
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