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数学 大学生・専門学校生・社会人

多様体を構成するために、位相空間に完全アトラスを導入するところで質問です。 完全アトラスを導入するメリットとして、この文章の下線部を「異なる座標系を用いたのに同じ計算ができてしまうという問題が解消される」解釈したのですが、そこがよくわかりません。座標系を変えて計算する... 続きを読む

1 Two n-dimensional coordinate systems & and ŋ in S overlap smoothly provided the functions on¯¹ and ŋo §¯¹ are both smooth. Explicitly, if : U → R" and ŋ: R", then ŋ 1 is defined on the open set ε (ur) → ° (UV) V and carries it to n(u)—while its inverse function § 4-1 runs in the opposite direction (see Figure 1). These functions are then required to be smooth in the usual Euclidean sense defined above. This condition is con- sidered to hold trivially if u and do not meet. Č (UV) R" Ĕ(U) n(UV) R" S n(v) Figure 1. 1. Definition. An atlas A of dimension n on a space S is a collection of n-dimensional coordinate systems in S such that (A1) each point of S is contained in the domain of some coordinate system in, and (A2) any two coordinate systems in ✅ overlap smoothly. An atlas on S makes it possible to do calculus consistently on all of S. But different atlases may produce the same calculus, a technical difficulty eliminated as follows. Call an atlas Con S complete if C contains each co- ordinate system in S that overlaps smoothly with every coordinate system in C. 2. Lemma. Each atlas ✅ on S is contained in a unique complete atlas. Proof. If has dimension n, let A' be the set of all n-dimensional coordinate systems in S that overlap smoothly with every one contained in A. (a) A' is an atlas (of the same dimension as ✅).

未解決 回答数: 0
英語 高校生

写真3枚目の青で印をつけているところについて質問です。 ①日本語訳の中に、しょっちゅう、 と書いてあるのですが、そのような 頻度を表すものはどこに書いてあったのでしょう ? ②A lotとありますが 、どうやったら、 たくさん理由があるのだ。 という日本語に導けるのでしょう... 続きを読む

構文解析 1 (In late December), (while home for the holidays), an old friend and I set out for a café (we'd been meaning to visit since high school. 和訳 12月下旬、体で家にいた頃、旧友と私は高校時代から訪れたいと思ってい た喫茶店に向かおうと家を出た。 set out 出発する」 mean to ~ 「~するつもりである」 2 (Thirty-five minutes into what should have been a fifteen-minute drive), we accepted that we needed help. 0 0 [和訳 和 15分運転すれば着くはずのところを35分運転したところで、私たちは助けが必 要なことを認めた。 3 "Just look it up (on your phone)," my friend said from behind the wheel. S 車を運転しながら友人が「ちょっとスマートフォンで検索してみて」と言った。 I look up ~ 「~を調べる」、 behind the wheel 「車を運転して」 lookup~ 4 "I can't," I replied, waving my Samsung flip phone, with no Internet capabilities), above the dashboard). 和訳 私はインターネット機能のないサムスンの折り畳み式携帯電話をダッシュボー ドの上でひらひらと振って「できないの」と返した。 「wave 「振る」 flip phone 「折り畳み式携帯電話」 wave, [2] ② 1 My friend sighed. 和訳 私の友人はため息をついた。 語句 sigh 「ため息をつく」

解決済み 回答数: 2
英語 高校生

写真の問題がわかりません。。 教えてください!

10 15 5 B) Read the following e-mail, and choose the best answer to each question. From: To: Date: Subject: Dear Mr. Westbrook, Elaine McGee <E_McGee@kingsley.co.uk> Nicolas Westbrook <nic_westbrook@heymail.com> June 25 Fashion columns ((1X2) = 4 points × 2, (3) = 5 points) Hello. I'm the editor of Kingsley Press. I'm writing to ask you to write a column for our publication “SUNNY," a monthly magazine which has been providing useful information for middle-aged men so that they can lead their lives cheerfully and actively. I have read your fashion blog, and liked the pictures and descriptions., Each article was very understandable and told me you have good taste. Also, I was impressed with your extensive knowledge of art. Currently, there are a lot of middle-aged men who can't decide what to wear or are not good at shopping for clothing. If you wrote a fashion advice column, it would probably be a great help to our readers. We are planning a column series titled "Brush up your fashion now." I would like you to write a one-page column of about 400 words with a picture of coordinates monthly. I am offering you $100 per article, but I would like to discuss this and other details with you later. If your columns are popular, we will ask you to write other columns about art or movies. Please contact me if you are interested. Sincerely yours, Elaine McGee Kingsley Press

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