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Expert  Average Ratings  Expertise 

Clyde OliverU.S.
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I can answer all questions up to, and including, graduate level mathematics. I am more likely to prefer questions beyond the level of calculus. I can answer any questions, from basic elementary number theory like how to prove the first three digits of powers of 2 repeat (they do, with period 100, starting at 8), all the way to advanced mathematics like proving Egorov's theorem or finding phase transitions in random networks.  
randy pattonU.S.
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college mathematics, applied math, advanced calculus, complex analysis, linear and abstract algebra, probability theory, signal processing, undergraduate physics, physical oceanography  
Janet YangU.S.
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I can answer questions in Algebra, Basic Math, Calculus, Differential Equations, Geometry, Number Theory, and Word Problems. I would not feel comfortable answering questions in Probability and Statistics or Topology because I have not studied these in depth.  
Sombra ShadowU.S.
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I can answer most questions up through Calculus and some in Number Theory and Abstract Algebra.  
David HemmerU.S.
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I can answer almost any question from undergraduate mathematics courses.  
Ahmed SalamiNigeria
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I can provide good answers to questions dealing in almost all of mathematics especially from A`Level downwards. I can as well help a good deal in Physics with most emphasis directed towards mechanics.  
SocratesAvailable

I can answer any questions from the standard four semester Calulus sequence. Derivatives, partial derivatives, chain rule, single and multiple integrals, change of variable, sequences and series, vector integration (Green`s Theorem, Stokes, and Gauss) and applications. PreCalculus, Linear Algebra and Finite Math questions are also welcome.  
Scott A WilsonU.S.
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I can answer any question in general math, arithetic, discret math, algebra, box problems, geometry, filling a tank with water, trigonometry, precalculus, linear algebra, complex mathematics, probability, statistics, and most of anything else that relates to math. I can also say that I broke 5 minutes for a mile, which is over 12 mph, but is that relevant? 
Well, they need to be two dimensional in order to stick to a surface. They could be formed as just part of the outside of a cylinder, but when torn off they'd be close enough to flat to work. Again
Please stop asking me these ridiculous questions. I am am mathematician, why would I know anything about touch screen displays? OF course it si possible to construct a calculator with a touchscreen display
The rectangular is the easiest to construct. Other shapes would cost more due to the waste involved in material that couldn't be used. See, if we take a piece of paper, and cut horizontal and circular
Yes, there are concentric conics. They have the same center or axis of symmetry. Note, however, that neither a parabola nor a hyperbola is circular. As for line shapes, the Wikipedia page states that
The only other circular shape I can think of is the outline of a piece of pie, and it can be used to construct concentric shapes as well. Since you have concentric cones and inverted concentric cones
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