# Principles and Examples of Plausible Reasoning and Propositional Plausible Logic

arXiv: https://arxiv.org/abs/1703.01697 · HTML: https://mlsanity.com/paper/1703.01697/

## Key facts

- Cited by 1 papers in the map (data through 14 Oct 2026).
- First posted on arXiv 6 Mar 2017.

## Built on by (most cited first, 1 of 1)

- [Plausible Reasoning and First-Order Plausible Logic](https://mlsanity.com/paper/2604.19036/) (2026)

## Abstract (arXiv)

Plausible reasoning concerns situations whose inherent lack of precision is not quantified; that is, there are no degrees or levels of precision, and hence no use of numbers like probabilities. A hopefully comprehensive set of principles that clarifies what it means for a formal logic to do plausible reasoning is presented. A new propositional logic, called Propositional Plausible Logic (PPL), is defined and applied to some important examples. PPL is the only non-numeric non-monotonic logic we know of that satisfies all the principles and correctly reasons with all the examples. Some important results about PPL are proved.