Function leafCountOf

src/compute-engine/rubi/normal-form.ts:239–244

(e: Expression)

}

function leafCountOf(e: Expression): number {
  if (!e.ops) return 1;
  let n = 1;
  for (const op of e.ops) n += leafCountOf(op);
  return n;
}

function negate(ce: ComputeEngine, e: Expression): Expression {
  if (isNumber(e)) return e.neg().evaluate();