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 ✅).

できれば解説付きで教えて欲しいです。 TOEICの問題です。

1. Local libraries offer reading programs for children and ESL for adults. (A) frequently (B) frequenting (C) frequent (D) frequented 2. This year's excellent has earned our production plant renowned in the Company. (A) performed (B) performable (C) performance (D) perform 3. Anyone who a new stove by CTX Ltd. this weekend receives a free fourpieces set of set of stainless -steel saucepans. (A) purchase (B) purchaser (C) purchases (D) purchasing 4. The primary concern among our manufactures is acquiring the necessary resources at a reasonable price. (A) finances (B) financed (C) financial (D) financially 5. Questions about production concerns should be to Ms. Bates. (A) direction (B) director (C) directs (D) directed 6. Last week's performance was judged to be a major even though it received no local media coverage. (A) success (B) succeed (C) successful (D) successfulness 7. Underwood Energy Services Inc. offers benefits to full-time employees, including dental insurance. (A) attraction (B) attractive (C) attract (D) attracted 8. Mr. Whatley unintentionally took Ms. Pots' timetable, thinking it was (A) him (B) himself (C) his (D) he

緑の蛍光ペンでひいている部分がなぜそうなるのか分からないので教えてほしいです💦

(6) I did not call on him yesterday for ( の anxiety 2 trouble 3 fear ④ care )Imight disturb him. (北海学園大) (6) 3 (7) As ( の soon )as l am a student, I must study hard. (聖学院大) 2 well 3 long ④ far (8) The session is to begin ( ) eleven in the morning. (札幌大) O in 2 at ③ from ④ on (9) I hope to learn French ( O during 2 for ③ while ④ until )my stay in Paris. (早稲田大) (10) ( ) you agree or not, I will not change my mind. (四天王寺国際仏教大) の Though ② While ③ Whether ④ Either (10) (11) 彼女は彼より5つ若い。 (武蔵大) She is younger than he ( O by 2 with ③ for ④ at ) five years. ) the south of Europe. (西南学院大) 3 for の at but (13) 医者は事故の方へ走っていた。(慶鷹義塾大) (12) Italy is ( O in 2 on 大) (12) _メ 1 ) the direction of the accident. The doctor was running ( O to 2 for ③ on ④ in (13) _/ 4 イ吉田+N +\

写真の問題を教えてください 流体工学の問題です

4. A simple accelerometer can be made froma U-tube containing water as in 200mm Figure. 1) When the acceleration of a car with the U-tube is a [m/s?] in the horizontal direction (x-direction), find the relation between a and the level difference h [m]. 2) When H vertical tubes at a = 0 is 250 mm, find the maximum accelaration which h = 400 mm and the water level ho for both H h。 can be measured by this accelarometer. Use g = 9.8 m/s? and pwater = 1000 kg/m?. y water x

高校の基礎問題みたいです。 上からお願いします。

They walked in the ( ) of Tokyo. A. period B. attitude C. direction D. position Those pictures ( ) Taro. A. were drawn by B. draw it by C. were drawn with D. was drawing by My friend passed by without( )me. A. noticing B. notice C. to notice D. noticed You look so tired, and I think ( )you need is an early night. A. which B. what C. that D. it I have great ( )in you. A. influence B. confidence C. audience D. experience

Directions: Write a paragraph responding to the prompt below. Your paragraph should be at least 100 words and include a topic sentence, s... 続きを読む

解き分わからない

【1 】As shown in Figure 1, here ame an object Aof mass AZ B ofmass 7 and Cof mass r On a smooth and horizontal surfce. A and B mre inlerconnected by a spring. The Spring has the naumi lcngth of / and a spring constant た A。 B, and C are on one straight Hime and can move along the stmight line. Tuke the right direction as positive fbr velocity Neglect the mass of the spring and air resistanee 国1に示すように, 水平でなめらかな台の上に質量 /の2つの物体 A, Bと質 基wの物体Cが静止している、A と Bはばね定数たで自然散7 のばねで結ばれ てでいるAB,Cは一直線上にあり, この直線上のを動くものとする. 速度の 向きは図の右向きを正にとるものとする. ばねの質基と空気抵抗は無視できる. (①) A and B are oscillated symmetically so ss for center of mass of A and B imtereonnccted by a spdng to be fixed. Find 7, the Gimc pcriod of the oscillgtion. ばねで千ばれた A と B の重心動かないように, A とB の重心に関して左右対 -称に振動させた場合の周期了を求めよ. Next A and B are atrest. The length of the spring is the natural length / で moving speed yo collides perfect-elastically with A. It is assumed that A and C are rigid, the coHlision occurs very shortly and the displacement during the colision is neglected Moreover iis also assumed tbat after the collision。 A snd C do not have nother の 次に, A と B をばねの長さが自然長 7 になる位置で静止させて, C を左から y の速度で A に衝突させる. この衝突は完全弾性衝突であり, かつ物体が非常に かたくて衝突は極めて短時間に行われ, 衝突中の変位の大きさは無視できるも のとする. さらに, Aと Cは一度笑突した後再びぶつからないものとする- の Find tie velociies yand ycofAand Cimmediaedy Ner he colison。 respectiweiy 衝突直後の A と C の速度w vcを求めよ. ⑬) Find the velocity yoof the cemlerofmassofAand B using が6 and ye 衝後の A と B の重心の束度woを44を用いて表せ (④ Find mc minimum lengtb ofthe pcng sferthe colision ing ヶ。 4 we かた 衝突後, Aと B が最も近接したときのばねの長さを ヵ, 7 w。 4を用いて表せ。 も Hi