The Harmonic Triads

[Ichthus77 (Ichthus77 (formerly She™))]

Updated: The Thingy - Google Sheets

New stuff, but some updates in the old stuff at the link^

5/17/26:
edit the last two rows that got the last two columns flipped: Triadic First Principle(s) - #46 by Ichthus77

Some stuff not yet included (leave it to the math nerds).

Many gleaned from this thread:

Complete the triad

What’s the third thing (fill in the blank) besides 1) deductive necessity of validity (truth) and 2) inductive sufficiency/actuality of soundness (justification/demonstration)? Answer: 3) abductive _________/possibility of conclusion/explanation (first principle/final cause)? In other words, complete the triad: validity △ soundness △ ________ Clue. Spoiler Alert ;^)