Truth = Knowledge + Understanding + Believe

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K = Knowledge (comes from Proving)
U = Understanding
B = Believe

U is the mediator between K & B

Truth = KUB
Eg. Mathematics:
1 + 1 = 2

KB = Know & believe but do not understand.
Eg. Diseases like cancer, Chinese Accupuncture, …

B: Believe but do not understand or know.
Eg. Axioms, Religion

K : Know but do not understand or believe.
Eg.

KU : Know, Understand but do not believe.
Eg.

U: Understand but do not know or believe.
Eg. ?

UB: Understand, believe but do not know.
Eg. [Impossible]