How to use in-sentence of “assertion”:
– A bare assertion denies that an issue is debatable.
– Some people think that every single assertion in an article needs to be cited.
– In logic, “ipse dixit” is known as the bare assertion fallacy.
– The main issue concerning our versions is that under ordinary circumstances, stating that something merely “exists” is not an assertion of its notability prec.
– In particular in “The Tao of Physics” he makes the assertion that physics and metaphysics are both inexorably leading to the same knowledge.
– I’m not even trying to “deny it” as you say, I don’t know where you got any evidence for that assertion of “fact”.
– While ideally every assertion and assumption that is not necessarily true would have the various positions on it detailed and referenced, in practice much of human knowledge relies on the probably true rather than the necessarily true, and actually doing this would result in the article devolving into an incoherent jumble of backtracking explanations and justifications.

