Function inverseFunctionFreeQ

src/compute-engine/rubi/rubi-utils.ts:2302–2312

(u: Expression, x: string)

): { scale: Expression; exp: Expression; rest: Expression | null } | null {
  const ce = u.engine;
  if (u.operator !== 'Multiply' || !u.ops) return null;
  let scale = ce.One;
  let exp: Expression = ce.Zero;
  let rest: Expression | null = null;
  for (const f of u.ops) {
    if (!f.has(x)) {
      scale = scale.mul(f);
      continue;
    }
    const m = monoPartsX(f, x);
    if (m !== null) {
      scale = scale.mul(m.coef);
      exp = exp.add(m.exp);
      continue;