Julia implementation of the Euler's explicit and implicit methods for solving first order differential equations.
Tries to be compliant with the ODE.jl API (https://github.com/JuliaLang/ODE.jl) in the functions' attributes' names and types
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Euler explicit method http://en.wikipedia.org/wiki/Euler_method
Euler implicit method http://en.wikipedia.org/wiki/Backward_Euler_method