Can we determine the number of theorems that can be proven with X axioms?

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Discussion Overview

The discussion revolves around the question of whether it is possible to determine the number of theorems that can be proven from a given set of X axioms within a consistent system. Participants explore metamathematical implications, the relationship between axioms and theorems, and the nature of tautologies versus theorems.

Discussion Character

  • Exploratory
  • Technical explanation
  • Debate/contested
  • Mathematical reasoning

Main Points Raised

  • Some participants propose that there could be infinitely many theorems derivable from a consistent system with X axioms, citing examples of tautologies and the nature of logical inference.
  • Others argue that the distinction between theorems and tautologies is crucial, with theorems being derivable from axioms while tautologies hold true under all valuations.
  • A participant suggests that axioms can be viewed as theorems since they can be proven within the system, leading to a debate about the definitions and roles of axioms and theorems.
  • It is noted that without inference rules, the number of theorems would be limited to the number of axioms, while the presence of rules could lead to an infinite number of theorems.
  • Some participants discuss the complexity of counting theorems, highlighting that different proofs can lead to the same theorem, complicating any attempt to quantify them.
  • A later reply introduces the idea of determining the minimum number of axioms necessary for internal consistency, using a metaphor related to practical systems.

Areas of Agreement / Disagreement

Participants express differing views on the relationship between axioms and theorems, the implications of having inference rules, and the feasibility of quantifying theorems. There is no consensus on whether a definitive number of theorems can be established based solely on the number of axioms.

Contextual Notes

Limitations include the dependence on the definitions of axioms and theorems, the role of inference rules, and the potential for multiple proofs of the same theorem, which complicates any straightforward counting of theorems.

  • #31
My * symbol means the same thing as --> (regular implies, not strict implies), and my post doesn't suggest otherwise. Yes, sorry, I missed that you were using --> in the ordinary way, but then I wonder what the point of your post was, and how it was a response to what lqg was saying. Well you said, "just thinking aloud" so perhaps it wasn't meant to be a response to what he was saying?
 
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  • #32
AKG said:
I wonder what the point of your post was, and how it was a response to what lqg was saying. Well you said, "just thinking aloud" so perhaps it wasn't meant to be a response to what he was saying?
That's exactly what I had intended, you read my thoughts. :smile:
 

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