# Changes related to "Nilpotent cone"

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Show new changes starting from 01:48, 26 April 2015
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#### 23 April 2015

• (diff | hist) . . Vector space‎; 16:23 . . (-413). .Slawekb (talk | contribs)(take it to the discussion page. the planetmath source (not a WP:RS) implicitly uses uniqueness of inverses (else one is not able to conclude (a^{-1})^{-1}=a, e.g. Let's keep the definition to what appears in sources, not our WP:OR.)
• (diff | hist) . . Vector space‎; 16:02 . . (+413). .David815 (talk | contribs)(Sorry for revert, but it works. There is no OR, esp. given that math is a priori. Full proof for unique inverses:http://planetmath.org/redundancyoftwosidednessindefinitionofgroup. And two-sided inverses are unique, as explained in the group article.)
• (diff | hist) . . Vector space‎; 10:52 . . (-413). .Slawekb (talk | contribs)(It is still WP:OR. The argument is unconvincing. You do implicitly use uniqueness of additive inverses. No, uniqueness doesn't follow from existence, unless we assume two-sidedness of the inverse.)
• (diff | hist) . . Vector space‎; 04:08 . . (+413). .David815 (talk | contribs)(Well, no. I don't use uniqueness of inverse. All I need is for an inverse to exist. Uniqueness actually follows without commutativity anyhow. Also, the thing with -1 follows from 0v=0, which is elementary.)