Leonhard Euler (/ˈɔɪlər/ OY-lər;[b] German: [ˈleːɔnhaʁt ˈʔɔʏlɐ] i, Swiss Standard German: [ˈleːɔnhart ˈɔʏlər]; 15 April 1707 - 18 September 1783) was a Swiss mathematician, physicist, astronomer, geographer, logician, and engineer who founded the studies of graph theory and topology and made pioneering and influential discoveries in many other branches of mathematics such as analytic number theory, complex analysis, and infinitesimal calculus. Euler uvua mumanyi wa malu a malu a bungi wa mu ditunga dia Suisse.
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