File:Proof of lemma l7 21 in Narboux.svg
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English: My illustration of lemma l7_21 from http://dpt-info.u-strasbg.fr/~narboux/tarski.html (as described in Julien Narboux (2007), "Mechanical Theorem Proving in Tarski’s Geometry", F. Botana and T. Recio (Eds.): ADG 2006, LNAI 4869, pp. 139–156 and based on W. Schwabhäuser, W Szmielew, and A. Tarski (1983), Metamathematische Methoden in der Geometrie, ISBN 0387129588). In use at http://wikiproofs.org/w/index.php?title=Midpoint |
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| Source | Own work, based on File:Parallelogram.svg by en:User:Limaner which was released into the Public Domain. |
| Author | Kingdon |
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I, the copyright holder of this work, hereby publish it under the following license:
 
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This file is made available under the Creative Commons CC0 1.0 Universal Public Domain Dedication. |
| The person who associated a work with this deed has dedicated the work to the public domain by waiving all of their rights to the work worldwide under copyright law, including all related and neighboring rights, to the extent allowed by law. You can copy, modify, distribute and perform the work, even for commercial purposes, all without asking permission.
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
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| current | 02:38, 4 July 2011 | | 255 × 175 (6 KB) | Kingdon (talk | contribs) |
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