Function has

test/compute-engine/solve-diophantine.test.ts:664–665

(x: number, y: number, z: number)

    const anyFree = r.ops!.some((t) => t.ops!.some((o) => o.symbols.length > 0));
    expect(anyFree).toBe(false);
    const has = (x: number, y: number, z: number) =>
      rows.some((t) => t[0] === x && t[1] === y && t[2] === z);
    // Known members within the box.
    expect(has(0, 0, 0)).toBe(true);
    expect(has(3, 4, 5)).toBe(true);