That's Euler, his formula was one of the inspirations that lead to the beginning of string theory which is kind of cool, not that funny, but it is cool.
این اویلره. فرمول اون یکی از ایده‌هایی بود که به آغاز تئوری ریسمان منجر شد که جالبه٬ خنده‌دار نیست٬ اما جالبه.