Mathematics
From algebra to calculus, from trigonometry to set theory, it's all here.
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From basic sequences, series and calculus, to measure theory, complex analysis and more advanced topics.
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Set theory, groups and ring theory, linear algebra, and other algebra-related topics.
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Home to threads on more applied (but non-physical/mechanical) threads; e.g. applied group theory or statisics.
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Ground-up mathematical tutorials.
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2400 topics in this forum
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I don't know much about the mathematics of chance but hear this out. What is the chance of this... You are using a message board with say, 20 other active users and 100 inactive anonymous users. All of the users are located within free countries... U.S., Canada, Europe, Australia, etc Nobody uses their photo. Nobody has identified themselves openly on the message board. And then one user posts a topic with a real photo of himself as his avatar. Another user sees that photo and thirty minutes later, at his place of work, somebody walks in who looks exactly and precisely like the person in that photo. Would you say this was a coinci…
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Reputation Points
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I have a series of 3d points in space they are on an arbitrary plane but i want to move them to a plane AX+BY+CZ+D=0 A=0, B=0, C=1, D=0 so the XY Plane.the matrices for this is identity.From the points i assume 0) All vectors will be unitized1) the first point in the polygon will be moved to 0,0,02) the first and second point in the polygon will define the vector for the X Axis3) the first point and the last point in the polygon will define a construction vector4) the cross product of the X Axis Vector and the construction vector will define the Z Axis vector5) the cross product of the X Axis Vector and the Z Axis Vector will define the Y Axis Vector6) using the three vec…
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Reputation Points
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Reputation Points
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Ok I wanted to see if this idea had any potential and I figured if it didn’t it would be shot down in a matter of minutes. This is my final work on the Prime product problem. I know it is just x^2 * y^2 = PNP^2 However the terms would just cancel out. Instead I have decided to let x^2 equal a pattern of x and PNP. So I just substituted the equation which is more complex and will not equal the right side of the equation for x^2. In calculus where you have a complex derivative where you let du/dx equal a portion of the derivative so you can understand and simplify the manipulation of the integral. I am instead taking a more complex pattern and leaving it so …
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Reputation Points
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So I am not sure if it was that I was applying the formula found on Wikipedia incorrectly, (if so hahaha) https://en.wikipedia.org/wiki/Summation but I developed a formula based off several similar ideas that, so far, has proven to work for all consecutive positive integers, I have not begun testing whether it is accurate with negative integers, or complex numbers (Though I would imagine that it would work with complex numbers because you calculate those very similarly to integers, but you follow special rules for them when they have exponentation etc.) \usepackage{asmmath}\displaymath:\[\sum_k^n=((n-k)+1)(\frac{n-k}{2}+k)\] As there is almost certainly a…
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Reputation Points
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To start I will say to explain as a start. Lets say you have a boss and he tells you to turn off and on a lamp an infinity amount of times for a hour. This is impossible . By lets say you divide the hour by 2 that means you turn it on a 30, then after that 45, than after that 52, than so on and so on. This is impossible to find the value of when the lamp is on or off. Now to explain why infinity is a false value. You see if we put a value in to anything with infinity there is a infant amount of outcomes but there is one thing that makes infinity a false value. Thanks to one man infinity is number that can never be used. Sir Isaac Newton. His law of matter that stat…
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Reputation Points
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In the set theory we have inductive sets which are those sets like \( A \) which \( \emptyset \in A\) and \( \forall a \in A (a^{+} \in A. \) and \( a^{+}= a \cup \{a\} \). Then we have the infinity axiom which says there exists an inductive set: \[ (\exist A) [\emptyset \in A \and (\forall a \in A) a^{+} \in A]. \] Now my question is how do we can conclude than infinity sets, specially those sets that are uncountable such as \( \mathbb{R} \) exists?
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Reputation Points
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Took me long enough, but here is the definitive proof to the collatz conjecture. Anyone able to endorse me to publish on arxiv? Collatz V2.1.pdf
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Reputation Points
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What are your methods to find that great math problem to invest your time to work on? Or any other project. I have my own methods but I want to hear others before I share my own.
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Reputation Points
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Solve for x. I don't have the math background to solve for x. But if you put in N and p, you will see this simplified equation. I plugged it into Wolfram Alpha, but solving for x is still a challenge. x^2 + (2 x^5)/N^2 alternate form (x^2 * (N^2 + 2 * x^3) / N^2 Plug in the known value N. Still impossible to solve. But if you plug in both x and N it proves true. Do you believe me now?
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Reputation Points
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If PQR are point such that the bearing of Q from P is 300° and the bearing of R from P is 120°. Find the bearing of Q from R
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Reputation Points
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Hello to everyone, Is it possible to write a mathematical formula that will give us the size of an object at various distances? For example, let's say we have a large cube that is 60 feet in size, and we wanted to know how many feet the cube would appear to be when we looked at it at these distances: .5 of a mile 1 mile 2 miles Is there a formula that can accurately calculate what the size of the cube would be when looking at it at these distances? Thank you, Chris
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Reputation Points
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Irrationality and logical paradox 1: Rational thinking and the self of rational thinking If and only if we know the definition of self in human thinking, can we know the structure of human thinking. I will start by discussing the basis of rational thinking-formal logic and use logical paradox as testing. There are three basic laws of formal logic. 1: The law of identity 2: The law of non-contradiction 3: The law of excluded middle The law of identity states that something is what it is. Expressed as symbols: A = A. The law of non-contradiction says that a …
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Reputation Points
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Wikipedia starts with this definition - but that looks to me like it would define an oval shape, ie one that is symmetrical. Elsewhere I have encountered the same kind of definition - taking two pegs with a length of string longer than the distance between and scribing a line with a third peg whilst pulling the string taut makes an ellipse shape. To me this looks like it describes only very specific sort of ellipse and is not a universal description of all ellipses. Rather than a cross section through a cone shape, this looks to me like it describes a cross section through a round cylinder. Am I missing something obvious here?
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Reputation Points
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The camera is always oriented in a way that lower border of HFOV (horizontal field of view) is aligned with bottom side of the object. Dimension of the object for reference camera tilt angle are given as well as contour area of this object on image plane. Parameters of camera (fields of view, focal length) are also known. Is it possible to calculate new changed contour area on image plane when camera tilt angle is changed (due to changing object distance or/and camera height)? I would be grateful if someone could point me to methods of calculations applicable here. I have found such method as camera transform using pinhole camera model to represent object…
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Reputation Points
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I have a grid through upon which a circle is drawn, as shown below. Now, for every square in the grid through which the circle runs, i want to calculate the proportion of the square covered by the circle. So one of the squares close up: I thought this would be relatively straightforward but i've ended up with a horribly convoluted way involving working at some angles where the circle crosses the squares, using that to find the area of the circle, then subtracting that from the area of a rectangle that contains that circle segment, and so on for other squares. Only need to do this for three squares as symmetry saves me a lot of work, but it's s…
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Reputation Points
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Hi all! This is not a homework question, just a silly thing I've been working on. I have a set of 11 random variables and one constant (that I don't know the value of). Every time I run an experiment all 11 variables assume a value of either 0 or 1 (all together). The question is simple: how to calculate the total number of experiments that I need to do in order for the average value of those 11 variables (from all experiments) to approach the mean of 0.5 to an accuracy of, let's say, 99.9%. After that I should be able to find out the value of my constant. Thanks for the help!
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Suppose have arbitrary ellipse with center (x,y) and its radius (a,b) . I want obtain rectangle that sides tangent of peripheral ellipse. the below image describe issue .
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Reputation Points
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I found a book (http://hades.mech.northwestern.edu/images/7/7f/MR.pdf#page=531&zoom=100,0,222 (page 517)) and there are some equations that bugs me. On pictures you can see that with equations from pictures 1 and 2 we can get equation on picture 4. How does that happen? I tried to solve it by myself but I got different first row in equation on picture 4. It will be much better if you show me how to get the last equation step by step. All Beta i equal to 0. l and w are shown in the picture 3 (those are lengths). wbz is an input variable, we doesnt need to know what it equals to for now.
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Reputation Points
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hello I am interested in topology anlysis what requirements or knowledge do I have to learn topology anlysis thanks you verf much
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Reputation Points
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I thought you guys might find this interesting. Adding Time to a 2D Prime Factor Harmonic Matrix to demonstrate the “behavior” of standing vs moving prime factor “waves” Previously I had introduced the Prime Factor Harmonic Matrix which showed that prime factors behaved like waves or specifically 1 dimensional waves that either behave like moving waves or standing harmonic waves within a 2 dimensional matrix of natural numbers. A PFHM is simply any matrix of natural numbers that is dimensioned according to a primorial. Paul Ikeda's answer to What’s the significance of prime numbers in physics and nature? Finding large Primes …
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Reputation Points
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I found an article with some equations and got some questions whether some of those equations are correct or not. On the picture you can see that matrix Tpi is on the left side, while matrix TR is on the right. Aren't they supposed to be vice versa? Link to the article: https://research.ijcaonline.org/volume113/number3/pxc3901586.pdf
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Reputation Points
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Continuity and uncountability Discussion about continuity of line, how continuity is related to uncountability and the continuum hypothesis. The real line is made of real numbers which are points. Points are discrete objects, but lines are continuous objects. How does continuity arise out of discreteness when points make line? The idea of uncountability solves this problem. Rational numbers are countable, the line they make contains holes. Real numbers are uncountable, the line they make is continuous. So, continuity must be created by the uncountability of the points of a continuous line. One can imagine that uncountable points are so numerous on the real line that real …
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Reputation Points
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Ok, you are going to laugh at this one. But I am seriously asking this question. I need to think outside the box if I want to break a one-way-function. In this case outside the triangle. My question is: Why can’t I combine the Law of Sines and the property of similar triangles to solve 2 different similar triangles of different sizes? And secondly why can’t I say the proportions in one triangle are not proportional to the same proportion in a similar triangle? I mean if all sides and angles are known in one and the other similar triangle all the angles are known, there has to be a method to solve the segments of the unknown, second similar triangle…
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Reputation Points
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