A false belief that is resistant to confrontation with actual facts.
A fixed, false belief, that will not change, despite evidence to the contrary.
The state of being deluded or misled, or process of deluding somebody.
That which is falsely or delusively believed or propagated; false belief; error in belief.
The result or product of being sound.
The property (of an argument) of not only being valid, but also of having true premises.
The property of a logical theory that whenever a wff is a theorem then it must also be valid. Symbolically, letting T represent a theory within logic L, this can be represented as the property that whenever T⊢𝜙 is true, then T vDash 𝜙 must also be true, for any wff φ of logic L.
The state or quality of being sound.