Re: [isabelle] Natural property

On Fri, 22 Sep 2006, Gabriele Pozzani wrote:

> Now from
> a * 1 < b * (a + 1)
> I would demonstrate the thesis but I don't know how to do that.

You just need to use the Ex-Introduction rule, i.e. append

thus ?thesis  
  apply(rule_tac x="1" in exI) apply (rule_tac x="a+1" in exI)
    by simp

to your proof.


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