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4.1.3 EXAMPLE The additive group R acts on the plane R2 by horizontal translation (a, (x,...
2. Įpp. 492, Marsden & Hoffman Let y : [a,b] → R and ψ : R → R be continuous. Show that A = {(x,o(x)) : x [a,아 C R2 has volume zero in R2 and the set B-{(x, ψ (x)) : x E R} C R2 has measure zero...
2. Įpp. 492, Marsden & Hoffman Let y : [a,b] → R and ψ : R → R be continuous. Show that A = {(x,o(x)) : x [a,아 C R2 has volume zero in R2 and the set B-{(x, ψ (x)) : x E R} C R2 has measure zero in IK.
2. Įpp. 492, Marsden & Hoffman Let y : [a,b] → R and ψ : R → R be continuous. Show that A = {(x,o(x)) : x [a,아...
The Moulton Plane is the plane M = (R2, LM) such that a subset I of...
The Moulton Plane is the plane M = (R2, LM) such that a subset I of R2 belongs to LM if and only if one of the following holds: i) l = {(x,y)| x=a} (vertical line); ii) l = {(x,y)| y=b} (horizontal line) iii) ( = {(x,y)| y = mx +b where m<0} (line with negative slope) [ m(x - x0) if x xo when m>0}. (bent line W 14,9 m ( x - x0) if x > xo with...
2. Define a function R R2 + R2 by 0 · x = Rox, where R_(cos...
2. Define a function R R2 + R2 by 0 · x = Rox, where R_(cos – sin o) R0 = 0 (sin cos 0 ) (a) Prove that this defines a left group action. (b) Let x € R2 – {(0,0)}. Describe geometrically Oz. (c) Compute Gr.
4. If G is a group, then it acts on itself by conjugation: If we let...
4. If G is a group, then it acts on itself by conjugation: If we let X = G (to make the ideas clearer), then the action is Gx X = (g, x) H+ 5-1xg E G. Equivalence classes of G under this action are usually called conjugacy classes. (a) If geG, what does it mean for x E X to be fixed by g under this action? (b) If x E X , what is the isotropy subgroup Gx...
2. Assume the group G acts on the set S. For E S, define Then G is a subgroup of G , which is called the stabilizer of r. The set is called the orbit of r (a) Consider the map ф' G S, defined...
2. Assume the group G acts on the set S. For E S, define Then G is a subgroup of G , which is called the stabilizer of r. The set is called the orbit of r (a) Consider the map ф' G S, defined by фг (g) :-9-x. Prove that there is one map (and only one) : G/G, S such that Vz ยู่'z q (where q: G -G/G, is the quotient map). (b) Prove that is injective. (Hint:...
1. (5 pts.) True oR FALSE: (a) Let R denote a plane region, and (u, v) - (u(x, y), v(x, y)) be a ...
1. (5 pts.) True oR FALSE: (a) Let R denote a plane region, and (u, v) - (u(x, y), v(x, y)) be a different set of coordinates for the Cartesian plane. Then for any function F(u, v) F(u, v)dudv-F(u(x, y), v(x, y))drdy (b) Let R denote a plane region, and (u,v) (u(x,y),o(x,y)) be a different set of coordinates for the Cartesian plane. Then dudv (c) Let R denote a square of sidelength 2 defined by the inequalities r S1, ly...
Q16 S CX}. If G has a group 15. The powerset of a set, X, is...
Q16
S CX}. If G has a group 15. The powerset of a set, X, is defined to be the collection of all subsets of X: P(X) = { S action on X, then the group action can be defined on P(X) by a. S = {a.s | SES}. (a) Show that if S = orb(r), then a.S= S for all a E G. (b) If a. S = S, show that S = U; orb(r) for some elements r;...
Implicit Function Theorem in Two Variables: Let g: R2 → R be a smooth function. Set {(z, y) E R2 ...
Implicit Function Theorem in Two Variables: Let g: R2 → R be a smooth function. Set {(z, y) E R2 | g(z, y) = 0} S Suppose g(a, b)-0 so that (a, b) E S and dg(a, b)メO. Then there exists an open neighborhood of (a, b) say V such that SnV is the image of a smooth parameterized curve. (1) Verify the implicit function theorem using the two examples above. 2) Since dg(a,b) 0, argue that it suffices to...
1. (5 pts.) TRue or FALse: (a) Let R denote a plane region, and (u,u) = (u(x,y), u(x,y)) be a dif...
1. (5 pts.) TRue or FALse: (a) Let R denote a plane region, and (u,u) = (u(x,y), u(x,y)) be a different set of l (b) Let R denote a plane region, and (u, v) - (u(x, y), v(x, y)) be a different set of coordinates for the Cartesian plane. Then for any function F(u, v F(u, u)dudu- F(u(x,y),o(x,y))dxdy coordinates for the Cartesian plane. Then (c) Let R denote a square of sidelength 2 defined by the inequalities |x-1, lul (3y,...
2. Assume the group G acts on the set S. For E S, define Then G...
2. Assume the group G acts on the set S. For E S, define Then G is a subgroup of G , which is called the stabilizer of r. The set is called the orbit of r (a) Consider the map ф' G S, defined by фг (g) :-9-x. Prove that there is one map (and only one) : G/G, S such that Vz ยู่'z q (where q: G -G/G, is the quotient map). (b) Prove that is injective. (Hint:...
2. Įpp. 492, Marsden & Hoffman Let y : [a,b] → R and ψ : R → R be continuous. Show that A = {(x,o(x)) : x [a,아 C R2 has volume zero in R2 and the set B-{(x, ψ (x)) : x E R} C R2 has measure zero in IK.
2. Įpp. 492, Marsden & Hoffman Let y : [a,b] → R and ψ : R → R be continuous. Show that A = {(x,o(x)) : x [a,아...
The Moulton Plane is the plane M = (R2, LM) such that a subset I of R2 belongs to LM if and only if one of the following holds: i) l = {(x,y)| x=a} (vertical line); ii) l = {(x,y)| y=b} (horizontal line) iii) ( = {(x,y)| y = mx +b where m<0} (line with negative slope) [ m(x - x0) if x xo when m>0}. (bent line W 14,9 m ( x - x0) if x > xo with...
2. Define a function R R2 + R2 by 0 · x = Rox, where R_(cos – sin o) R0 = 0 (sin cos 0 ) (a) Prove that this defines a left group action. (b) Let x € R2 – {(0,0)}. Describe geometrically Oz. (c) Compute Gr.
4. If G is a group, then it acts on itself by conjugation: If we let X = G (to make the ideas clearer), then the action is Gx X = (g, x) H+ 5-1xg E G. Equivalence classes of G under this action are usually called conjugacy classes. (a) If geG, what does it mean for x E X to be fixed by g under this action? (b) If x E X , what is the isotropy subgroup Gx...
2. Assume the group G acts on the set S. For E S, define Then G is a subgroup of G , which is called the stabilizer of r. The set is called the orbit of r (a) Consider the map ф' G S, defined by фг (g) :-9-x. Prove that there is one map (and only one) : G/G, S such that Vz ยู่'z q (where q: G -G/G, is the quotient map). (b) Prove that is injective. (Hint:...
1. (5 pts.) True oR FALSE: (a) Let R denote a plane region, and (u, v) - (u(x, y), v(x, y)) be a different set of coordinates for the Cartesian plane. Then for any function F(u, v) F(u, v)dudv-F(u(x, y), v(x, y))drdy (b) Let R denote a plane region, and (u,v) (u(x,y),o(x,y)) be a different set of coordinates for the Cartesian plane. Then dudv (c) Let R denote a square of sidelength 2 defined by the inequalities r S1, ly...
Q16
S CX}. If G has a group 15. The powerset of a set, X, is defined to be the collection of all subsets of X: P(X) = { S action on X, then the group action can be defined on P(X) by a. S = {a.s | SES}. (a) Show that if S = orb(r), then a.S= S for all a E G. (b) If a. S = S, show that S = U; orb(r) for some elements r;...
Implicit Function Theorem in Two Variables: Let g: R2 → R be a smooth function. Set {(z, y) E R2 | g(z, y) = 0} S Suppose g(a, b)-0 so that (a, b) E S and dg(a, b)メO. Then there exists an open neighborhood of (a, b) say V such that SnV is the image of a smooth parameterized curve. (1) Verify the implicit function theorem using the two examples above. 2) Since dg(a,b) 0, argue that it suffices to...
1. (5 pts.) TRue or FALse: (a) Let R denote a plane region, and (u,u) = (u(x,y), u(x,y)) be a different set of l (b) Let R denote a plane region, and (u, v) - (u(x, y), v(x, y)) be a different set of coordinates for the Cartesian plane. Then for any function F(u, v F(u, u)dudu- F(u(x,y),o(x,y))dxdy coordinates for the Cartesian plane. Then (c) Let R denote a square of sidelength 2 defined by the inequalities |x-1, lul (3y,...
2. Assume the group G acts on the set S. For E S, define Then G is a subgroup of G , which is called the stabilizer of r. The set is called the orbit of r (a) Consider the map ф' G S, defined by фг (g) :-9-x. Prove that there is one map (and only one) : G/G, S such that Vz ยู่'z q (where q: G -G/G, is the quotient map). (b) Prove that is injective. (Hint:...
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