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- 17:14, 11 July 2007 Drorbn talk contribs deleted page 06-240: Edit2.jpg (content was: 'Image:Edit2.jpg----Another proof of the same lemma: <br>a*(-b)+a*b=a*((-b)+b)=a*0=0 <br>hence a*(-b)=-a*b <br>But we need another lemma f...')
