Revision as of 23:07, 26 June 2012 edit Chricho (talk \| contribs) Extended confirmed users 860 edits →Decidability unknown for elementary functions: new section ← Previous edit		Revision as of 14:34, 13 May 2013 edit undo 77.126.235.228 (talk) →Decidability unknown for elementary functions Next edit →
Line 161: But isn’t <math>\|x\|=\sqrt{x^2}</math> elementary presentable? --[[User:Chricho\|Chricho ∀]] ([[User talk:Chricho\|talk]]) 23:07, 26 June 2012 (UTC) :The problem is that there are 2 square roots to each number, and the choice between them cannot be controlled. So <math>\sqrt{x^2}</math> could also mean <math>x</math>, or <math>-x</math>--[[Special:Contributions/77.126.235.228\|77.126.235.228]] ([[User talk:77.126.235.228\|talk]]) 14:34, 13 May 2013 (UTC)

Talk:Risch algorithm: Difference between revisions