No, not any recursion can be expressed as a  tail recursion. One example: 
the Ackermann function (http://en.wikipedia.org/wiki/Ackermann_function)

On Saturday, July 21, 2012 11:15:33 AM UTC+2, Mimmo Cosenza wrote:
>
> Hi,
> a very basic question. Any "not tail recursion" code can be reduced to 
> tail recursion code? 
>
> Thanks
>
> Mimmo
>

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