The level of rigor expected in mathematics has varied over time: the Greeks expected detailed arguments, but at the time of Isaac Newton the methods employed were less rigorous.
Tingkat kekakuan diharapkan di dalam matematika selalu berubah-ubah sepanjang waktu: bangsa Yunani menginginkan dalil yang terperinci, namun pada saat itu metode yang digunakan Isaac Newton kuranglah kaku.