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→Section Removed: attempt at clarification
:And I just put that right back. The problem is that people ''have'' used tautology ''as an argument'', and also have tried to prove their definitions by assertion. In writing the above you have just defended proof by assertion as a legitimate form of argument. That will not stand.--[[User:TerryH|TerryH]]<sup>[[User talk:TerryH|Talk]]</sup> 18:39, 7 May 2008 (EDT)
:And I just put that right back. The problem is that people ''have'' used tautology ''as an argument'', and also have tried to prove their definitions by assertion. In writing the above you have just defended proof by assertion as a legitimate form of argument. That will not stand.--[[User:TerryH|TerryH]]<sup>[[User talk:TerryH|Talk]]</sup> 18:39, 7 May 2008 (EDT)
::My understanding of a tautology is that it states the obvious out of formal necessity, usually as a prelude to the real argument. Things like "all triangles have three sides". I must be missing something here: can you give an example of an argument which is really a statement of a tautology? [[User:Eoinc|Eoinc]] 18:58, 7 May 2008 (EDT)