For 10 points, name this Swiss mathematician who went blind in 1766 and whose namesake number is the base of the natural logarithm.
This scientist's namesake circle was conceptualized through the creation of this scientist's namesake diagrams. This scientist's namesake line passes through the centroid, circumcenter, and orthocenter of a triangle. This scientist proved that the Seven Bridges of Konigsberg problem had no solution. This scientist's namesake method is used to numerically approximate differential equations and in his namesake identity, e to the quantity i times pi plus one equal zero. For 10 points, name this Swiss mathematician who went blind in 1766 and whose namesake number is the base of the natural logarithm.
This scientist's namesake circle was conceptualized through the creation of this scientist's namesake diagrams.
Leonhard {Euler}