Function foq

test/compute-engine/rubi-utils.test.ts:270–271

(v: Json, u: Json)

    expect(cond(['ProductQ', ['Add', 'x', 2]])).toBe(false);
    expect(cond(['ProductQ', 'x'])).toBe(false);
  });

  test('MemberQ[{…}, u] tests structural membership', () => {
    const inv = ['List', 'ArcSin', 'ArcCos', 'ArcSinh', 'ArcCosh'];
    expect(cond(['MemberQ', inv, 'ArcSin'])).toBe(true);