Can a Negative Claim Ever Be Proven?

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Discussion Overview

The discussion revolves around the question of whether a negative claim can ever be proven, exploring various perspectives on the nature of proof in different contexts, including mathematics, science, and everyday reasoning. Participants examine examples such as the existence of oranges in a bowl and the existence of God to illustrate their points.

Discussion Character

  • Debate/contested
  • Conceptual clarification
  • Exploratory

Main Points Raised

  • Some participants argue that proving a negative is context-dependent, with examples like asserting there are no oranges in a bowl being easier to prove than claiming there is no God.
  • Others suggest that in mathematics, negative claims can be proven through principles like contradiction, while in real life, a proper epistemological model is necessary to define "proof."
  • One participant emphasizes the difference between proof in mathematics and science, noting that scientific claims are based on evidence rather than strict proof.
  • Another participant challenges the idea of proving negatives by discussing the limitations of observation, using the example of a teapot in orbit to illustrate that absence of evidence does not equate to evidence of absence.
  • Some participants express skepticism about claims of non-existence, suggesting that without solid tests or evidence, one cannot justifiably claim something does not exist.
  • There is a discussion about the implications of observational limitations, particularly in the context of claims about God versus more tangible examples like oranges.
  • Several participants note the distinction between specific claims (like the presence of oranges) and broader existential claims (like the existence of oranges as a concept).

Areas of Agreement / Disagreement

Participants do not reach a consensus on whether negative claims can be proven, with multiple competing views presented throughout the discussion. The nature of proof and the context in which claims are made remain points of contention.

Contextual Notes

Limitations in the discussion include varying definitions of proof, the reliance on observational evidence, and the challenges of proving non-existence in different contexts.

  • #31
TheStatutoryApe said:
I do not understand what is unreasonable about it. I am fairly certain that scientists have not access to the universe as a whole and only make observations of small parts of it in order to draw conclusions about the nature of the whole.
They don't draw conclusions, but they do make working assumptions and extrapolate.

But you cannot extrapolate to show something does or doesn't exist.
 
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  • #32
TheStatutoryApe said:
make observations of small parts of it in order to draw conclusions about the nature of the whole.

Making predictions about unobserved phenomena, based on observed phenomena is inductive reasoning. It is not the same as direct observation, whether it uses direct observation as basis or not.

Science involves prediction based on evidence; inductive reasoning.
It is not pure observation.

You cannot 'prove' something with induction, like you can with deduction.
http://en.wikipedia.org/wiki/Problem_of_induction

Even observations can be faulty and lead to error.

You cannot 'prove' that something doesn't exist, simply by saying you've never seen it.
You cannot 'prove' that something unseen exists based on what you can see.

You can make all kinds of assumptions, predictions, and inferences, but that is not proof.
 

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