The modern definition of a limit ( for any ε there exists an index `` N '' so that ... ) was given by Bernhard Bolzano ( `` Der binomische Lehrsatz '' , Prague 1816 , little noticed at the time ) and by Karl Weierstrass in the 1870s .
The modern definition of a limit ( for any ε there exists an index `` N '' so that ... ) was given by Bernhard Bolzano ( `` Der binomische Lehrsatz '' , Prague 1816 , little noticed at the time ) and by Karl Weierstraß in the 1870s .