Possible Applications of Proving Non-Linear Functions on Curves

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Discussion Overview

The discussion revolves around the problem of proving the equivalence of certain properties related to a twice differentiable function and its associated curve. The focus is on exploring potential applications of this proof, particularly in relation to ergodics, while clarifying the mathematical concepts involved.

Discussion Character

  • Exploratory
  • Technical explanation
  • Conceptual clarification
  • Homework-related

Main Points Raised

  • One participant presents a problem involving a twice differentiable function and asks for possible applications of proving the equivalence of certain properties related to the curve defined by the function.
  • Another participant seeks clarification on the notation used, specifically regarding the meaning of \(\Gamma + \Gamma\) and how set addition is defined in this context.
  • A clarification is provided that \(\Gamma + \Gamma\) refers to the naive addition of sets, defined as \(\{ a+b: a \in A, b \in B\}\).
  • There is a general request for ideas or suggestions regarding the applications of the proof presented.

Areas of Agreement / Disagreement

Participants have not reached a consensus on specific applications of the proof, and the discussion remains open-ended with requests for further input.

Contextual Notes

There are limitations in the clarity of the problem statement and the definitions used, particularly regarding the notation and the implications of set addition. The discussion does not resolve these ambiguities.

Who May Find This Useful

Readers interested in mathematical proofs, applications of non-linear functions, and ergodic theory may find this discussion relevant.

Kreizhn
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I was given a problem by a professor to prove the following problem:

If [itex]f:[0,1] \to \mathbb R[/itex] is a twice differentiable function, define [itex]\Gamma = \{y = f(x)\}[/itex] the curve associated to f. Show that the following are equivalent:
  1. [itex]m(\Gamma+\Gamma)>0[/itex]
  2. [itex]\Gamma +\Gamma[/itex] contains an open set.
  3. f is non-linear

Anyway, I have done this but am supposed to remark on possible applications. I'm not sure to what I could apply this though. Maybe something to do with ergodics? Any suggestions would be appreciated.
 
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Any suggestions?
 
I take it you mean that [itex]\Gamma[/itex] is the set [itex]\{(x, y)| y= f(x)\}[/itex].

What do you mean by [itex]\Gamma+ \Gamma[/itex]? How are you adding sets?
 
Yes, that is what I meant. Sorry for the sloppiness, though I believe it's not an uncommon shorthand.

Set addition is taken to be naive: nothing special like essential sums. So
[tex]A+B = \{ a+b: a \in A, b \in B\}[/tex]
 
Anybody have any ideas?
 

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