Mathematical proof   I agree with gandalf that the text you are adding to the mathematical proof article has serious issues please see TalkMathematicalproofRemovednonsense Also please note that repeatedly adding material despite objections is likely to get this address blocked from editing but not result in any permanent change to the article Please discuss the change on the articles talk page and only add it again if you can find some agreement on what it should say Im not sure that the term proof by intuitive lemma is common in any way  Carl