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Mathematics Undergraduate

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... Read More

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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Mathematics Senior High

(1)の前提から分かりません 教えてください。

1からnまでの番号が書かれたn枚のカードがある。 このn枚のカードの中か ら1枚をとり出し, その番号を記録してからもとに戻す. この操作を3回くり返 す.記録した3個の番号が3つとも異なる場合には大きい方から2番目の値を x とする. 2つが一致し、 1つがこれと異なる場合には,2つの同じ値をXとし 3 つとも同じならその値をXとする. ドが5枚 (1)確率 P(X≦k)(k=1, 2,......,n) を求めよ. (2) 確率P(X=k) (k=1, 2, 思考のひもとき ..... n) を求めよ. (千葉大) UNI 1.P(X≦k) とはXがk以下となる確率のことである. 2P(X=k) はX=k となる確率だから 解答 P(X=k)=P(X≦k) P(X≦k-1) (1) 記録する3個の番号の並び方は ㎥通りある.(どれが起こるのも同様に確からしい) 3つのうち,k+1以上の枚数は, 0, 1, 2, 3のいずれかである. このうちX≦k となるのは次のいずれかのとき. (i) 記録した3個の番号がすべて以下のとき(つまり,k+1以上が0枚のとき) この場合は通り. 2 () 記録した3個の番号のうち1つがん+1以上(a とする), 2つがk以下(b,cと する)のとき(つまり,k+1以上が1枚のとき) OSI ak+1よりは b≦k, c≦kより6cの選び方は n-(k+1)+1=n-k(通り) (通り) aが3回のうちのどこで出るかは C=3(通り) 3.k2(nk) 通り よって、この場合は (i), (ii)は排反だから P(X≦k)= k3+3k²(n-k)_3nk2k n 3 n 2) (1)の結果を用いると

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English Junior High

(1)の答えがD、(3)の答えがウ、(6)の答えがイ なんですけど、なんでそれになるかと、5⃣で3~5程の段落で分けるとしたらどこになるのか、またその段落はそれぞれどんな題名になるのかを教えて欲しいですm(_ _)m

学院) E J 5 次の英文を読んで、あとの問いに答えなさい。 < 星野改〉 High schools in Minnesota have a problem Many students are late to school. They are often tired. Some students fall asleep in class. They often get sick, too. The local governments take that as a problem. They make a small change.) It helps a school day a little later/ A lot! What do they do? They start the D- This small change makes a big difference. Why? Most teens are very tired early in the morning. They usually don't go to bed until after midnight In the morning, they wake up between 6:00 and 6:30 for school. So they don't get enough sleep! They are still tired early in the morning. But after the change/ teens are more awake and later start time is better for a teen's body clock I be ready/class/to/in). A be in ready class Everyone has a body clock. An adult's body clock works like this: most adults get tired between 9:00 and 11:00 at night. They usually go to bed before midnight. Adults can get up early in the morning. It's not a problem. But a teen's body clock is different. Teens don't get tired at midnight. They usually stay up later. But early in the morning, they need more sleep. B FO C The schools in Minnesota pay attention to the teen's body clock. They change the start of the school day from 7:20 a.m. to 8:40 a.m., 80 minutes later. Other schools in the United States change their start times too. Some schools change the time by only 30 minutes, but they still get good results. ( 2 ), the results are amazing! ③(Many) students are on time. Morning classes are easier to teach. Students are getting ①(good) grades. Students have fewer illnesses, so they are ⑤(little) absent. In Minnesota, there is another important effect: fewer students drop out of school or change schools. D Today, more and more high schools are starting later. Most schools can't start two hours later. But they can change the start time a little. A small change can make a very big difference! Just ask the students. Minnesota ミネソタ (アメリカ合衆国中央北部の州) (1) 次の英文を入れるのに最も適する位置を, 本文中のA~Dから1つ選びなさい。 Now the students are happier, and also the parents and teachers too. D(A) (2)下線部①の ( )内の語を並べかえて正しい英文を作るとき, 3番目にくるものをア~エから1つ選びなさい。 ア be イ ready ウ class I to (3) 20)( )に適するものを, ア~エから1つ選びなさい。 7 On the other hand (4) 3~50)( 1 However ウ In fact I Even so )内の語をそれぞれ比較級にかえなさい。 (3) much (5)本文の内容にあうものを,ア~エから1つ選びなさい。 more (T!) better ⑤⑤ fewer Less High school students in Minnesota are always taking classes seriously. Most teens usually go to bed as early as possible. Most adults don't stay up late because of their body clocks. I Some schools changed the school time but their students did not have good grades. 本文のタイトルとして最も適するものを,ア~エから1つ選びなさい。 7 Fewer Illnesses 1 Late Start Body Clock I Good Sleep イ (土)

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