Function sameNumerically

test/compute-engine/rubi-utils.test.ts:305–313

(a: Expression, b: Expression)

    const r = build(
      ['RationalFunctionExponents', ['Divide', ['Add', ['Power', 'x', 2], 1], ['Add', ['Power', 'x', 3], 'x']], 'x'],
      ctx
    );
    expect(r.operator).toBe('List');
    expect(r.ops![0].isSame(2)).toBe(true);
    expect(r.ops![1].isSame(3)).toBe(true);
  });

  test('FunctionOfLog[u, x] detects u = F(Log[a·xⁿ]) (RUBI.md §5, R19)', () => {
    // The 3.5 `∫F(Log[a·xⁿ])/x` rule feeds Cancel[x·u]; the CE `Cancel` cannot
    // cancel a common x monomial (x/(x+x·Log²) → 1/(1+Log²)), so functionOfLog
    // does it itself. Result is the triple {F(x), a·xⁿ, n}.
    const asTriple = (j: Json) => build(['FunctionOfLog', j, 'x'], ctx);