[isabelle] Proofs involving Integers



Hello,

I am having trouble proving the following lemmas that involve integers.
For example, the following:

lemma "-(x * (i + (1::int))) = - ((x * i)+x)"

or

lemma "- (x * (i + (1::int))) + x = - (x * i)"

I was looking for a distribution rule for mult. and add. to try to simplify these lemmas but I was not able to locate something appropriate.

Any help is appreciated.

TIA

George





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