Recent content by blue_raver22

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    MHB Determine whether the equation is exact. If it is exact, find the solution

    I would first clarify that the equation being referred to is a differential equation, as it involves a derivative. I would also mention that finding the solution using the "pitchfork method" is a common approach in solving exact differential equations. To answer the question, yes, the equation...
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    MHB Simple Grammar Problem: Is "a" or "the" Ideal in Lie Algebra?

    Hello Dan, Thank you for sharing your question. You are correct that the grammatical error in this context is a minor one, but it is important to clarify for the sake of clear communication. In this case, it would be more accurate to use "the" instead of "a" before "maximal solvable ideal"...
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    Boundary absorption when simulating wave equation

    As a fellow scientist, I can understand your frustration with finding practical solutions in academic papers. However, it is important to note that mathematical rigor is necessary in scientific research to ensure accuracy and validity of results. That being said, there are some simple...
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    MHB Identifying the Degree of a Differential Equation

    The degree of a differential equation is determined by the highest power of the highest order derivative present in the equation. In this case, the highest order derivative is \frac{{d}^{2}y}{d{x}^{2}} and it is raised to the power of 2. Therefore, the degree of this differential equation is 2.
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    MHB To Prove that The Level Set Of A Constant Rank Map is a Manifold

    I would first commend the author for their thorough and rigorous approach to proving the statement. The use of the inverse function theorem and the careful construction of the function $F$ are key components in the proof. Regarding the final step, I would suggest considering the definition of...
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    Obstruction Theory and Embeddings

    The use of Chern classes and other characteristic classes can indeed extend to the existence of embeddings. Chern classes are a powerful tool in differential geometry and topology that help us understand the geometry of vector bundles. They can be used to determine the existence of embeddings in...
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    Boundary conditions - unique solution

    I can understand your confusion and concerns about using two arbitrary values to determine the constants A and B in the solution of a differential equation with a periodic boundary condition. However, the fact that the solution (1) satisfies the given boundary condition for any value of x is a...
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    Understanding Basis Change with Hamiltonian Matrices

    I can understand your confusion about basis change problems. Let me explain the concept of basis change and how it relates to Hamiltonian matrices. A basis is a set of linearly independent vectors that span a vector space. In other words, any vector in that space can be written as a linear...
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    MHB Transformation of a Parallelogram

    Your solution is well-written and explains the reasoning behind why the image of a point in $P$ under transformation $T$ lies in the parallelogram determined by $T(\textbf{u})$ and $T(\textbf{v})$. However, you could provide more explanation on why the set $P'$ is a parallelogram if $\textbf{u}'...
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    MHB Show that a Parametric Equation Maps To Another Line By Linear Transformation.

    Your solution is correct. You have correctly shown that the parametric equation $\textbf{x} = \textbf{p} + t\textbf{v}$ maps to another line or a single point through the linear transformation $T$. This is a fundamental property of linear transformations, and it is important for understanding...
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    MHB Metric Spaces & Compactness - Apostol Theorem 4.28

    An adherent point of a set A is a point x such that every neighborhood of x contains at least one point of A. An accumulation point of a set A is a point x such that every neighborhood of x contains infinitely many points of A. To understand why m = inf f(X) implies that m is adherent to f(X)...
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    MHB Continuity and Compact Sets - Bolzano's Theorem

    Hello Peter, Bolzano's Theorem states that if a function f is continuous on a closed interval [a,b] and takes on values of opposite signs at the endpoints, then there exists a point c in the interval where f(c) = 0. In the proof of this theorem, Apostol uses a proof by contradiction. He...
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    MHB The set {0,1}^ω is not countable

    To deduce that the powerset of $\{0,1\}^{\omega}$ is $\omega$, we can use the Cantor's theorem which states that the cardinality of the powerset of a set is always greater than the cardinality of the original set. Since $\omega$ is the smallest infinite cardinal number, it follows that the...
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    Third order differential equation

    I can understand your confusion with the transition from second order to third order differential equations. Let me explain it to you in a simpler way. A differential equation is an equation that relates a function with its derivatives. The order of a differential equation is determined by the...
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    Differentiability of a function on a manifold

    Yes, your explanation is correct. By using the coordinate charts, you have shown that the function f is differentiable in both charts, and the differentiability is independent of the choice of chart. This is because the composition of two differentiable functions is also differentiable...
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