"propositions about" is correct and usable in written English.
You can use it when you are introducing a suggestion or idea about a certain topic. For example: "The professor made several propositions about the best ways to reduce carbon emissions."
Unlike propositions about relations of ideas, propositions about matters of fact are known only through experience.
That is to say, we recognise them as propositions about which reasonable, informed people may disagree.
Numbered subsections suggest a series of propositions, about marginality, education, privilege, rather than a felt story.
Thus: "Water boils at 100 degrees Celsius" can be verified or falsified, while propositions about God cannot (they claimed).
(Some philosophers have preferred to say that propositions about fictional or nonexistent entities are neither true nor false).
Certain wffs of LPC-with-identity express propositions about the number of things that possess a given property.
Let's start with five propositions about which there is little doubt: The economy is in bad shape.
The material too often seems tame and lifeless, a series of provocative propositions about health and illness rather than a full-blooded drama.
Perhaps most counterintuitively, the fatalist argues that this topsy-turvy doctrine can be established by mere reflection on the simple logic of propositions about the future.
As for the propositions about the civil war and the consequences of Sherman's decisions in The March, "they tend to be accurate in detail.
Even though the Tories weren't offering any solutions or propositions about what they would do to relieve these problems, they were talking about them, and that clearly resonated.
