Image: Coq 8.5 stdlib proof

Description: A screenshot of the w:Coq proof assistant (version 8.5) during the process of proving a property of the comparison operation on the natural numbers. The left pane displays the editable script of the proof, while the top right pane indicates the current state of the proof – the goals to be proved, currently focused goal and hypotheses in context. The opened file is part of the standard library of mathematical theories of the software.
Title: Coq 8.5 stdlib proof
Credit: Own work (Matěj Grabovský)
Author: INRIA
Permission: This screenshot either does not contain copyright-eligible parts or visuals of copyrighted software, or the author has released it under a free license (which should be indicated beneath this notice), and as such follows the licensing guidelines for screenshots of Wikimedia Commons. You may use it freely according to its particular license. Free software license: This library is free software; you can redistribute it and/or modify it under the terms of the GNU Lesser General Public License as published by the Free Software Foundation; either version 2.1 of the License, or (at your option) any later version. This library is distributed in the hope that it will be useful, but without any warranty; without even the implied warranty of merchantability or fitness for a particular purpose. See version 2.1 and version 3 of the GNU Lesser General Public License for more details. http://www.gnu.org/licenses/lgpl.htmlLGPLGNU Lesser General Public Licensetruetrue Note: if the screenshot shows any work that is not a direct result of the program code itself, such as a text or graphics that are not part of the program, the license for that work must be indicated separately. Bahasa Melayu ∙ Bahasa Indonesia ∙ British English ∙ italiano ∙ sicilianu ∙ Deutsch ∙ català ∙ magyar ∙ čeština ∙ português do Brasil ∙ norsk bokmål ∙ Esperanto ∙ kaszëbsczi ∙ español ∙ português ∙ English ∙ français ∙ Nederlands ∙ norsk ∙ polski ∙ galego ∙ română ∙ slovenčina ∙ slovenščina ∙ suomi ∙ svenska ∙ Tiếng Việt ∙ Türkçe ∙ Ελληνικά ∙ български ∙ македонски ∙ русский ∙ українська ∙ മലയാളം ∙ ไทย ∙ 한국어 ∙ 日本語 ∙ 中文 ∙ 中文（台灣）‎ ∙ 中文（简体）‎ ∙ 中文（繁體）‎ ∙ עברית ∙ العربية ∙ فارسی ∙ +/−
Usage Terms: GNU Lesser General Public License
License: LGPL
License Link: http://www.gnu.org/licenses/lgpl.html
Attribution Required?: Yes