Certainty is dual to uncertainty (doubt) -- the Heisenberg certainty/uncertainty principle. Deductive knowledge is dual to inductive knowledge. "Imagination is more important than knowledge" -- Einstein.
Logical knowledge is dual to empirical knowledge -- knowledge is dual. Noumenal (rational, analytic) is dual to phenomenal (empirical, synthetic) -- Immanuel Kant. Thesis is dual to anti-thesis -- the time independent Hegelian dialectic.
@@joshhoodrat451 As Popeye said many times, I yam wot I yam an thas all wot I yam. There is no concrete evidence of anything except my thoughts. The evidence that you exist is very poor.