The Dalles, Oregon From Wikipedia, the free encyclopedia Jump to navigation Jump to search This article is about the city in Oregon. For the nearby geological formation, see Celilo Falls. For other uses, see Dalles. Not to be confused with the town of Dallas, Oregon. City in Wasco County The Dalles City The Dalles and the Columbia River in November 2008 Flag Seal Motto(s): "Cognito timor Vincit" (Latin), "Knowledge Conquers Fear" (English) Location in Oregon Coordinates: 45°36′4″N 121°10′58″W / 45.60111°N 121.18278°W / 45.60111; -121.18278 Coordinates: 45°36′4″N 121°10′58″W / 45.60111°N 121.18278°W / 45.60111; -121.18278 County Wasco County Incorporated 1857 Government • Mayor Stephen Elliott Lawrence (D) [1] [2] Area [3] • Total 6.61 sq mi (17.12...
Clash Royale CLAN TAG#URR8PPP 是主理想域，更一般地說，歐幾里德環恆為主理想環。
是主理想環。
是主理想環，其中 ω 為任一非 1displaystyle 1
的三次單位根。
非主理想環：可以證明理想 (2,5)displaystyle (2,sqrt 5)
無法由單個元素生成。
