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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 ✅).

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英語 高校生

紫マーク①のfoodにsomeがついているのにsが付いてない理由と②のonの役割(使われ方)、訳し方を教えてください🙏🏻

Unit species 教科書 Listening 1 Part 1 pp.10-11, 195 音声を聞いて,( 内に適する語を書き取りましょう。 A Dictation J: Hey! How was your day? ~を見てまわる K: It was good, thanks. We've just finished ( /00king) (2 around the ) J=Jess K= KaiS=Shin (② Wellington Night Market. J: Great-how was it? らいらない 屋台 K: It was so cool! We tried (③ Some food from the stalls and there was a great live band on. 2 J: Nice. What are you ( UP ) (⑥ To ) tomorrow? Jess? かって J: Umm, have you (Ⓡ been ) ( +0 K: Te Papa? What's that? S: Well, we haven't really decided yet . . . . Do you have any (⑦ ever ~に行ったことがありますか? すいせん recommendations' ) Te Papa yet? J: Oh, it's the ( National Museum of New Zealand する価値ありますか? 絶対に S: No, we haven't been to any museums yet. Is it ( worth ) (Ⓡ seeing )? J: Well, if you like history or animals, you should definitely (1) 15 it )(⑩ out ). They have a ( (13 check ) realy)(heat ) すばらしい ( exhibit) about giant moa. 展示品 B Vocabulary Check (1) 本文の内容に合った品詞を( )内に,意味を 1.stall (名)屋台 2. recommendation (名)推薦 4. neat 5.moa 3. definitely (副)絶対に に記入しましょう。 (形) すばらし (名) モア

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