To be fair the question was kind of naive, about language, but T. Tao bother to answer and made my day. https://mathoverflow.net/questions/206544/why-do-people-

To be fair the question was kind of naive, about language, but T. Tao bother to answer and made my day. https://mathoverflow.net/questions/206544/why-do-people-use-formal-calculation-to-describe-informal-calculations https://mathoverflow.net/questions/206544/why-do-people-use-...