cianfa72's latest activity
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cianfa72 replied to the thread I About the existence of Hamel basis for vector spaces.Ah ok. So your claim is that every vector has an Hamel basis even though it can't proved without assuming the Axiom of Choice (AC)... -
cianfa72 posted the thread I About the existence of Hamel basis for vector spaces in Linear and Abstract Algebra.It is well known that a vector space always admits an algebraic (Hamel) basis. This is a theorem that follows from Zorn's lemma based on...
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cianfa72 replied to the thread I Follow-up Einstein Definition of Simultaneity for Langevin Observers.Thinking about it, based on what explained here, I believe the key point is as follows. The Langevin frame field has as timelike unit...
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You can measure proper acceleration locally. Put a mass on a spring balance held at rest with respect to you. Does it register weight...
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For a circuit to be without stored energy, it must be a matrix of resistors. For such a three terminal device, you would be unable to...
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cianfa72 replied to the thread 3-terminal device external modeling.Ah yes, you're right. Forget for a moment device's internal energy storage (or assume it operates in DC). Then characteristic curves...
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cianfa72 replied to the thread 3-terminal device external modeling.Why ? Take for instance the case of BJT. It isn't linear, yet we can draw its characteristic curves. Note that by the term "equation"...
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cianfa72 reacted to PeterDonis's post in the thread I Follow-up Einstein Definition of Simultaneity for Langevin Observers with
Like.
No. "The same Langevin worldline" means a worldline that's one of those at the radius you're working with. -
cianfa72 replied to the thread I Follow-up Einstein Definition of Simultaneity for Langevin Observers.@DrGreg in that thread argued that the spacelike surface defined by the set of 1D spacelike helices, each orthogonal in the tangential...
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cianfa72 replied to the thread 3-terminal device external modeling.Even without knowing how it works internally, we can always trace its characteristic curves. To do that define a common terminal (say...
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You can't really describe a network without seeing what's inside of it. For a passive LTI network you should be able, with source...
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cianfa72 replied to the thread 3-terminal device external modeling.Exactly. Suppose now to have a new type of electronic device with three terminals. Are we sure we can always describe it externally by...
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I think the only thing you can say for the most general case is that the terminal currents all sum to zero (KCL) and that there are two...
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cianfa72 replied to the thread I Follow-up Einstein Definition of Simultaneity for Langevin Observers.Ah ok. So starting from one single 1D spacelike line Minkowski orthogonal to the Langevin worldlines on the cylinder of given radius...
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cianfa72 replied to the thread 3-terminal device external modeling.Right, but it isn't my point. Consider a three terminal electronic device, whatever. What is the number of equations that the 3 current...
