Three very important concepts of philosophical truth are

• truth by correspondence (with the external world)
• truth by consistency (internal to logic)
• truth by coherence (of logic and the world).

A fourth is pragmatic truth, said of beliefs that have practical consequences, as agreed upon by an open community of inquirers in the long run.

Correspondence is also known as synthetic (a posteriori) truth, as "matters of fact." (Leibniz and Hume).

Consistency is also known as analytic (a priori) truth, truth by definition of terms, sometimes circular and tautological, as "truths of reason" (Leibniz) and "relationship of ideas." (Hume).

The idea of a fixed absolute timeless Truth in information terms appears to imply that everything is known, and thus determined.

But scientific truths of the world are at best provisionally held, subject to further experiment. Nothing is logically true of the world. Just as there is nothing physically certain or necessary. Truth within logic retains its correct formal use, but logic itself has its limits.

We find very congenial Charles Sanders Peirce's definition of truth about the external world as the current intersubjective agreement of an open community of inquirers.