Let X = {A, B, C, D} with d(A, D) = 2, but all the other distances equal to 1. Check that d is a metric. Prove that the metric space X is not isometric to any subset of En for any n. Can you realise X as a subset of a sphere S2 of appropriate radius, with the spherical 'great circle' metric?

Please help with the following mathematics problems.
(a) Let f be a differentiable functions defined on an open set U. Suppose that P is a point in U that f(P) is a maximum, i.e.
f(P) >= f(X) for all X E U
Show that grad f(P) =0
(b) Find the global maximum of the function
f(x,y)=x^3 +xy
def...

See the attached function and answer the following questions:
(a) Is f invertible?
(b) In which points does f have a local inverse?
(c) Determine the derivative of the local inverse at f((-1,1)) and f((1,-1))

Let f: R^3 --> R^2 by given by
f((x,y,z)) = (x^2 + y^2*z^2 + y*z^2)
and let g: R^2 --> R^2 be given by
g((u,v)) = (log(1 + u^2v^2), u^3v)
Use the Chain Rule to compute (g o f)' at (1,0,1)

Consider the following function:
f(x,y) = xy
on the set S = {x^2 +4y^2 ≤ 1}.
a) Explain by applying a relevant theorem why f(x,y) has a global maximum and a global minimum in the set S.
b) Find the critical of f in the interior of the set S.
c) Use the method of Lagrange multiplier...

Given two position vectors x and h, Taylor's formula up to order two can be written as:
(See attachment)
a) Write down Taylor's formula in two variables (x,y) with h = (h,k)^T, using Di to denote partial derivatives.
b) State the conditions that partial derivatives commute, namely, D1D2f = D...

Steve is buying a farm and needs to determine the height of a silo on the farm. Steve, who is 6' tall, notices that when his shadow is 9' long, the shadow is 105' long.
How tall is the silhouette?

Consider the function f (x, y) given by f (x, y) = ( 1 - x^2 - y^2)^2.
a) Sketch the graph of the curve f (x, 0) for x e [-2,2].
b) Sketch the level curves for f (x, y) = c for c = 0, c = 1/4, c = 3/4 and c = 2. Also plot the level set for f (x,y) = 1.
See attachment for full question.

See attachment for equation and full problem set.
a) Find a parametric representation of the tangent line to the curve C2 at t = 1
b) Derive the equation of the normal plane to the curve C2 at t = 1, of this form
ax + by +cz = d
c) Find the distance of the plan in (b) and the origin (0,0,...

Lines with special relationships to the sides and angles of a triangle determine proportional segments. When you know the length of some segments, you can use a proportion to find an unknown length.
You are making the kite shown on the right (see attachment) from five pairs of congruent panels. ...

The medial triangle of a triangle ABC is the triangle whose vertices are located at the midpoints of the sides AB, AC, and BC of triangle ABC. From an arbitrary point O that is not a vertex of triangle ABC, you may take it as a given fact that the location of the centroid of triangle ABC is the vect...

Theorem: If the consecutive midpoints of the sides of a parallelogram are joined in order, then the quadrilateral formed from the midpoints is a parallelogram.
A. Prove the theorem given above in Euclidean geometry using synthetic techniques.
1. Include each step of your proof.
2. Provide w...

A. Discuss differences between neutral geometry and Euclidean geometry.
B. Explain the importance of Euclid's parallel postulate and how this was important to the development of hyperbolic and spherical geometries.

Task:
A. Discuss differences between neutral geometry and Euclidean geometry.
B. Explain the importance of Euclid's parallel postulate and how this was important to the development of hyperbolic and spherical geometries.
Note: Euclid's parallel postulate states the following: "For every...

Let P1 be the orthogonal projector onto the subspace $1, P2 the orthogonal projector onto the subspace$2. Show that, for the product P1P2 to be an orthogonal projector as well, it is necessary and sufficient that P1 and P2 commute. In this case, what is the subspace onto which P1P2 projects?

Given:
It is important to know how to use dynamic, interactive software programs such as The Geometer's Sketchpad, Cabri Geometry, GeoGebra, or Google SketchUp, to improve the teaching and learning of geometry.
Task:
1. Distinguish between static and dynamic geometry problems.
2. Use ...

Need to write a proof for the following:
Given: BAC is a right angle
DEC is a right angle
line DB bisects line AE
Prove: C is the midpoint of line DB. I've attached the question that needs to be proved. I need the proof on the attached document called "...

What is reliability at t=1?
Reliability distribution where the failure rate is given by r(t)=0, t<0 , and r(t)= sin(t)+1, for t>0. What is reliability at t=1?
See the attached Word document for the full problem, properly formatted.

In my latest battle with squirrels, I have strategically hung my bird feeder so that a squirrel cannot steal my birdseed. I attach string to a branch 15 feet off the ground and 3 feet from the trunk. If I attach the other end to a circular spool of radius 1 foot that 3 feet off of the ground and 10 ...

Please complete the appropiate proof using a 2-column proof format with statements on the left and reasons on the right.
** Please see the attached PDF document for the complete problem explanation and the associated diagram **

1.
a) Suppose T_1 is a topology on X = {a,b,c} containing {a}, {b} but not {c}. Write down all the subsets of X which you know are definitely in T_1. Be careful not to name subsets which may or may not be in T_1.
b) Suppose T_2 is a topology on Y = {a,b,c,d,e} containing {a,b}, {b,c}, {c,d} and {...

1) The definitions of surface (in terms of gluing panels) and what it means for two surfaces to be topologically equivalent.
2) A description of the three features of surfaces that characterize them in terms of their topology.
3) Three examples of pairs of surfaces that agree on two of the fea...

Hello.
My name is Clark. I build musical instruments as a hobby and am building a stringed instrument that requires a spiral shaped gear. To generate this gear I need the geometry for the spiral (I can add the teeth). I have attempted to express the problem in the simplest way that I can. I...

I have these problems from Topology of Surfaces by L.Christine Kinsey: the problems I require assistance with are 2.26, 2.28, 2.29, and 2.32. These are stated below.
PROBLEM (Exercise 2.26). Describe what stereographic projection does to
(1) the equator,
(2) a longitudinal line through the no...

Let Fr(A) denote the frontier set of A and Cl(A) denote the closure of A, where A is a subset of R^n. Solve the following problems.
Exercise 2.6: For any set A, Fr(A) is closed.
Exercise 2.12: If A and B are any sets, prove that Cl(A and B) belongs to Cl(A) and Cl(B). Give an example where Cl(...

2. Let X be given the co-finite topology. Suppose that X is a infinite set. Is X Hausdorff? Should compact subsets of X be closed? What are compact subsets of X?
3. Let (X,T) be a co-countable topological space. Show that X is connected if it is uncountable. In fact, show that every uncountable s...

The question we want to answer is as follows. For a nonempty compact Hausdorff topological space X and a continuous function f:X-->X we want to show that there is a fixed set A for f, that is, A is nonempty and f(A)=A.
We also construct an example of a Hausdorff space X which is not compact for w...

The following question is answered:
Let f:X-->Y be a continuous onto map. Let D be a subset of Y such that YD has at least n connected components. Prove that Xf^(-1)(D) has at least n connected components.
Are the line and the plane with their usual topology homeomorphic?

City Designer Project
Your city must have at least six parallel streets, five pairs of streets that meet at right angles and at least three transversals.
All parallel and perpendicular streets should be constructed with a straight edge and a compass. Use a protractor to construct the transver...