我國數學“知識共享”生態圈，持久存在，不斷擴大
六年來，無窮小放飛網際網路，推出袖珍電子書系列，特別是，黨的十九大之後，向全國高校輪番投放魯賓遜微積分教材（OER），伴隨“知識共享”許可協議的宣傳與普及，目前，國內數學“知識共享”生態圈已經初步形成，正在不斷髮展，永續性的存在。
一般而言，數學作品有兩大類：一類是“版權私有”，一類是“知識共享”。前者久已存在，後者新生事物（存在不足20年）。
數學作品形成有生命力的“生態圈”的必要條件是“知識共享”的一項重要屬性：
ShareAlike — If you remix, transform, or build upon the material, you must distribute your contributions under the same license as the original.
簡而言之，數學作品一旦“知識共享”，其衍生作品就永久“知識共享”。這是“知識共享”生態圈的應有之義。
“知識共享”促進開放教育資源（OER）越滾越大 形成生態圈，是必由之路。
袁萌 陳啟清 11月21日
附件：魯賓遜微積分教材的“知識共享”許可協議全文，請仔細閱讀、理解。
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