Recent content by HeisenBerg46
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Graduate Extremely difficult System of Differentil Equations
Nice reasoning! Another way to solve it would be to ignore the physical aspects and treat the time derivative as a normal derivative. Granted the answer wouldn't be as accurate as yours, but it is possible and could be solved using Laplace transforms (although the physical component would be lost).- HeisenBerg46
- Post #21
- Forum: Differential Equations
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Graduate Extremely difficult System of Differentil Equations
But you'd at least need values of x(0), x'(0), y(0), y'(0), z(0), z'(0) to use Laplace Transforms. Also, it would help to have a number in place of the variable a for a real-life problem.- HeisenBerg46
- Post #19
- Forum: Differential Equations
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What is the solution to this puzzling brain teaser?
Find the series representation of the antiderivative and sum it out until you see a correspondence in the two expansions.- HeisenBerg46
- Post #4
- Forum: Calculus
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Graduate Challenge: Submit Extremely Difficult Math Problems
Yes... I was looking for original problems with an answer, not just proofs. But to answer your initial problem, they correspond to the real part of the roots of the xi function, which are more easily calculated. These problems are very interesting though...- HeisenBerg46
- Post #3
- Forum: General Math
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Laplace transform of cos2(t-1/8π), help?
The answer really depends on which one you mean. Remember that the laplace transform of cos(a*t)=s/(s^2+a^2) for a real number a and s/(s^2+a) for complex s.- HeisenBerg46
- Post #3
- Forum: Calculus and Beyond Homework Help
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Laplace transform of piecewise functions
Which is e^(-2s) because the laplace transform of the unit step function with a step at c is e^(-sc). It works the same way with all step functions, and you can even find an approximate method for the dirac delta function.- HeisenBerg46
- Post #7
- Forum: Calculus and Beyond Homework Help
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Laplace Transform and Convolution
The unit step function is zero until you reach c (the x coordinate of the first step) and after that, the lower boundary of the integral that is the Laplace transform can be restricted to c. If you factor out e^(-s*c), you are left with e^(-s*c)*L(f(t)) where f(t-c) is the function that the unit...- HeisenBerg46
- Post #11
- Forum: Engineering and Comp Sci Homework Help
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What is the Laplace Transform of cos(3t)*u(t)?
H(s)=*L(cos(3t)(s))=s/(s^2+9) because L(cos(omega*t)(s)=s/(s^2+omega^2) for real s and s/(s^2+a) for complex s- HeisenBerg46
- Post #2
- Forum: Engineering and Comp Sci Homework Help
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Graduate Higgs Field/Particle: Evidence for Theory?
The Higgs Field is a great way to explain spontaneous gauge symmetry breaking which affects almost everything pertaining to the Universe and its origins. As far as I know, there is no other quantum physical way to explain the creation of the inhomogeneities that eventually expanded into the...- HeisenBerg46
- Post #5
- Forum: High Energy, Nuclear, Particle Physics
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Graduate Challenge: Submit Extremely Difficult Math Problems
I am looking for extremely challenging math equations/problems to solve. I would appreciate any problems in any field of mathematics (almost nothing is too difficult). Note that I am looking for straightforward problems with an answer (not proving someone else's conjectures). Who knows, others...- HeisenBerg46
- Thread
- Challenge
- Replies: 28
- Forum: General Math