Intersection Definition and 712 Threads

I'm trying to find a reasonably fast method for testing whether or not a point (x,y euclidean coordinate system) lies inside a (preferably convex, concave or complex - though different methods for each would be OK) compound polygon with edges consisting of line segments, arcs and/or elliptical...

I am having trouble calculating the volume of an unconventional and variable geometric shape (the fork of a tree). I have a conical (frustum) segment which splits and merges at the smaller end into the larger end of 2 smaller conical (frustum) segments and need to calculate the volume of the...

Does anyone know where I can find an algorithm for the points of intersection of two ellipses existing with arbitrary center points and rotations and having 0, 1, 2, 3 or 4 points of intersection?

y=x^5 x=y(y-1)^2 find points of intersect correct to 1 decimal point

Homework Statement Let's say that we have a second order polynomial function, and we know all of the points where it intersects with the x and y axis. Ex: (-2; 0), (0; 2), (1; 0) How does on determine the ax^2+bx+c polynomial form based on that? Homework Equations - The Attempt at...

Discrete Math: prove B intersection A = A, given A-B = null set 1. Problem Statement: Prove B \cap A = A, given A-B = ∅ (empty set) The Attempt at a Solution xε(B\capA) => xεB and xεA => Logic given A-B = ∅ => xεA I tried using A-B = A\cap!B for xε(A\cap!B)=∅ => xεA and x not in !B or...

Does anyone know of an algorithm to detect the intersection of any two functions - both for individual points within a fixed range of x values and determining whether or not total points of intersection are finite or infinite over an infinite range of x values? Also, is this possible to do this...

Homework Statement Find the points nearest and furthest from the origin on the intersection of a plane with a paraboloid. Plane: x+y+2z=30 Paraboloid: z=x^{2}+y^{2} Homework Equations The Attempt at a Solution Obviously the first step is to find the equation of the...

Homework Statement Two points represented by z_{1}, z_{2} lie on circle |z|=1, the tangents to the circle at these points meet at the point represented by Homework Equations The Attempt at a Solution Let the tangents meet at the point z_{3}. The centre of the given circle is (0,0)...

Homework Statement I have a line obtained from using a slope of 1 and point (-sqrt(2),sqrt(2)): y - sqrt(2) = 1 (x+sqrt(2)) y = 2*sqrt(2) + x and a circle with radius 5 centered at origin. My thought was to solve this parametrically The line is the tangent line (blue...

Homework Statement I will use an example to showcase my confusion: Suppose a person watches show A 2/3 of the time, show B 1/2 of the time, and both show A and show B 1/3 of the time. For a randomly selected day, what is the probability that the person watches only show A? For a randomly...

Homework Statement Let A, C \subseteq ℝn with boundaries B(A) and B(C) respectively. Prove or disprove : B(AUC) O B(A)UB(C) and B(A\capC) O B(A)\capB(C) Where O represents each of these symbols : \subseteq, \supseteq, = Homework Equations I know that double inclusion is going to cut the...

Homework Statement what is the torque if you know the the line of force intersects the center of the rotation ? Homework Equations The Attempt at a Solution I think the torque will be T= ( f*sin (45) )*d But I'm not sure will there be a torque or not ...the intersection of...

Prove that every closed set in $\mathbb{R}$ is the intersection of a countable collection of open sets. Let $G_n$ be a countable collection of open sets. Then we would have 2 cases either $x\in\bigcap G_n$ which is a point which is closed. Or we could $(a,b)$ in all $G_n$ but how to show that...

Homework Statement Locus of the point of intersection of tangents to the parabolas y^{2}=4(x+1) and y^{2}=8(x+2) which are at right angles, is Homework Equations Equation of tangent for first parabola t_{1}y=x+1+at_{1}^{2} Equation of tangent for second parabola t_{2}y=x+2+bt_{2}^{2}...

Homework Statement The question is attached in the picture. The Attempt at a Solution I have found the direction vector of the intersection line, but I have yet to find a point that lies on both planes... I've thought about having \hat{m} and \hat{n} as basis vectors, but i...

Ive tried finding the intersection point that I labeled I. first try: Because I know the points A and M1 I found |AM1| Then I said |AM1| = |AI| + |IM1| and proceeded to solve and came up with -16 = 2(I1)2 +I2)2 + I3)2) - 10I1 - 8I2 - 3I3 +√(blah blah blah) Second attempt: Law of...

At least I think it's via linearization. Let f(x) = \tan (x^2) - 1 and g(x) = \frac{\ln((x+1)^3)}{3} Find the smallest positive and negative intersection with a relative error of less than 0.001. I don't know. You can linearize one or both, yeah, but you don't have any analytical value to...

Hi all, I have a question. Suppose f : [ 0, l) \rightarrow ℝ is concave , increasing and continuous where l < ∞ and g : [ 0, l) \rightarrow ℝ is also concave, nondecreasing and continuous on the same interval. Can we claim that f and g intersect finitely many times in this interval (possibly...

Homework Statement Find parametric equations for the line of intersection of the planes x + y + z = 1 and r = (1, 0, 0) + \lambda(2, 1, 0) + \mu(0, 1, 1) where \lambda, \mu \in R Homework Equations The Attempt at a Solution I attempted to convert the 2nd plane equation to scalar form by...

Homework Statement Find symmetric equations for the line of intersection of the planes The planes: 5x - 2y - 2z = 1 4x + y + z = 6 Homework Equations r = r0 + tv x = x0 + at y = y0 + bt z = z0 + ct The Attempt at a Solution I have attempted this in many different manners and would like...

Homework Statement Show that these lines intersect and what is the intersection point? x=1+t y=2t z=1+3t and x=3s y=2s z=2+s Homework Equations The Attempt at a Solution I don't know how to start, some help please.

I would like to find a way to get the intersection points of a circle and a sphere in 3d. The center of each and their radii are known. This needs to be a general solution so that I can move the center of the sphere in steps and find the intersection at each step. I am curious if this can be...

Working on another problem here with varying results. I have three line segments in 3D and am looking to find what would be a projected intersection between two. This projected intersection is defined by a ray that is perpendicular to the axis a and passes through both segments f and s. f...

Homework Statement Find parametric equations for the tangent line to the curve of intersection of the cone z=√(x2 + 4y2) and the plane 3z = x + 2y + 8 at the point (3,2,5) 2. The attempt at a solution I was trying to make the two Zs equal to each other, and solve for x or y, but I couldn't...

Homework Statement I have to find the slope of the tangent line at (-1,1,5) to the curve of intersection of the surface z = x2 + 4y2 and the plane x = -1 2. The attempt at a solution I really am having trouble figuring out where to start. The question is even numbered, and the only one...

1. Homework Statement R,M are Noetherian. Prove that the radical of the annihilator of an R-moduleM, Rad(ann(M)) is equal to the intersection of the prime ideals in the set of associated primes of M (that is denoted so regretfully that I am not even allowed to spell it out by the system)...

Homework Statement Line of intersection between P1: x+y+z=7 and P2:2x-3y-z=-8 crosses the XZ plane at point A and crosses the YZ plane at point B Find the length Of AB Okay so first of all i`m having trouble with understanding crossing the `XZ`plane or `YZ`plane. does this mean that...

why intersection of empty class of sets is the whole space while their union is null set? Book writes that an element will fail to be in the intersection if it fails to be in one of the sets of the class but since there is nothing in the empty class so there is nothing in the empty class that...

Homework Statement If a ring R contains two ideals B and C with B+C=R and B\capC=0, prove that B and C are rings and R\congB x C. Homework Equations B+C={all b+c|b\inB and c\inC} The Attempt at a Solution So far I've discovered that if the unit of R is in one of the ideals then...

Homework Statement If S and T are subgroups of a finite group G, prove that [S:1][T:1] ≤ [S\capT:1][S\veeT:1]Homework Equations Notation: [A:B] is the number of cosets of B in A for some subgroup B of A. note that [A:1] is the order of A. Lagrange's Theorem: For some subgroup S of G...

Homework Statement Homework Equations The Attempt at a Solution \text{Differentiate }{{C}_{2}}:\text{ }\dfrac{d{{y}_{2}}}{dx}=\dfrac{x}{y} \text{Therefore, use }Q(-a,-b)\text{ for MQ: }{{y}_{2}}-(-b)=\dfrac{-a}{-b}\left( x-(-a) \right)\text{ }\Leftrightarrow...

I couldn't find any resources in my book or online dedicated to this subject. I honestly don't even know where to begin for this problem. Homework Statement Let f(x,y) = 4 / (1+ x^2 + y^2) and let S be the surface given by the graph of f(x,y) b) Let C2 denote the curve in the xy-plane...

Homework Statement Given the curves r=2sin(θ) and r=2sin(2θ), 0 ≤ θ ≤ pi/2, find the area of the region outside the first curve and inside the second curve Homework Equations obviously set up an intersection to see where the two meet, then subtract the circle equation from the rose...

One of the most frequent questions in this forum is why there is a contradiction between General Relativity and Quantum Mechanics. The most frequent answer is that, in high-energy conditions, some integrals diverge, giving nonsense. I could not find a mention of which integrals one is talking...

Homework Statement Find cartesian equations of the line of intersection of the planes x+3y-6z =2 and 2x+7y-3z=7 The Attempt at a Solution What I did first was I cross product the 2 equation and then I got 33i-9j+k Then I took both of the equation and let y = 0. After that my answer seems...

Homework Statement Kindly view my 1st attachment. I need help to get the intersection of the highest line and the line extended by a slope from the horizontal line. Homework Equations y=mx+b y-y1=m(x-x1) The Attempt at a Solution Kindly view my 2nd attachment. By substitution, I...

Homework Statement Determine whether the following two lines intersect: (x-2)/2 = (y+3)/1 = (z-4)/-3 ,and (x+3)/4 = (y+4)/1 = (-z+8)/4 Find an intersection point, then find the distance between the lines. Homework Equations Symmetric equations of a...

Consider f_1,..., f_k, g_1,..., g_l in a polynomial ring C[x_1,...,x_M], where f_i's are homogeneous of degree 2 while g_j's are linear polynomials. Suppose the codim of the variety cut out by S_1 = {f_1,..., f_k} is k while the codim of the variety cut out by S_2 = {g_1,..., g_l} is l...

Im new to the forum, so I didnt know where to post this. (x is cross-product, . is dot-product and * is multiplication) Consider point P with linear velocity Pv. Consider points A and B that define the edge AB of a square with C as center. Consider that C has linear velocity Cv and...

Hi all, it seems that there is a rule of thumb used by some researchers looking at nonlinear systems whereby they determine the stability of fixed points based on the product of the gradients of the null clines at the point where they intersect. in particular if the product of the gradients...

Homework Statement (a) Find the 6th complex roots of √3 + i. (b) Let A={z|z^6 =√3+i} and B={z|Im(z)>0} and C={z|Re(z)>0}. Find A ∩ B ∩ C. Homework Equations z^6=2(cos(π/6)+isin(π/6)) r^6=2, r=2^1/6 6θ=π/6+2kπ, θ=π/36+kπ/3 The Attempt at a Solution I've done part (a): When k=0, z =...

Homework Statement A curve is defined by the parametric equations: x = 2t^3 y = 2t^2 t =/ 0 1)Prove that the equation of the tangent at the point with parameter t is 2x - 3ty + 2t^3 = 0. Proven, and I've no problem with this part. 2.)The tangent at the point t = 2 meets the curve...

Hello everyone.. I'm stuck on this and don't really know what equations to apply or how you get the answer. An and Kat go on each Friday to the cinema independently of each other. On any given Friday the probability of both going to the cinema is 1/3. And the probability that at least one of...

Homework Statement I have a triangle with given vertices ABC. Given a vector that starts from A and intersects side BC, how can I find the point of intersection, p? Thanks Homework Equations The Attempt at a Solution

Homework Statement The line L is parallel to the vector 3i - 2j -2k and passes through the point P (1,0,-1/2) find the point of intersection Q of the line L with the plane ∏ x+y+z=2 The Attempt at a Solution I'm completely stumped with this, don't know where to start... I thought...

Homework Statement Ok, I need to find the angle at which I will throw an object (O1) so that it intersect with another one (O2) already in motion. I know the speed of each object (constant speed, no acceleration), I know the angle of O2 and its distance from me at time=0 Homework...

Homework Statement Let C be a cylinder of radius 1. It is cut by the x-y plane from below, and by the plane z-x=1 above. Parametrize all the surfaces of the cylinder. Find a unit normal (pointing outward) for each surface. Homework Equations Equation for a cylinder: x^2+y^2=1 Equation of the...

Homework Statement Plane 1:2x-3y+8z=7 Plane 2:x-8y+z=14 Plane 3:5x-14y+17z=28 Homework Equations N/A The Attempt at a Solution I took plane 1 and subtracted (plane 2)x2 to get 13y+6z=-21 (I will refer to this as equation 1) Then I took (plane 2)x5 and subtracted plane 3 to get...

Prove that f(\cap T_\alpha)=\cap f(T_\alpha) for all choices of (T_\alpha) \alpha \in \lambda if and only if f is one-to-one. I've been working on this on and off for a day and have nothing to show for it... Any help pointing me in the right direction would be appreciated. Also, more...