What makes you so sure? Euler's approach to problem solving is legendary for still being good pedagogical material today: http://eulerarchive.maa.org/hedi/index

What makes you so sure? Euler's approach to problem solving is legendary for still being good pedagogical material today: http://eulerarchive.maa.org/hedi/index.html http://eulerarchive.maa.org/hedi/index.html