lowing the expression denoting the atom. This very handy notation may be used in several different ways. A complication is that some Atoms may have CompositeTruthValues, which consist of differ- ent estimates of their truth value made by different sources, which for whatever reason have not been reconciled (maybe no

long-term importance, representing the estimated value of the Atom on immediate and long- term time-scales. In practice many Atoms are labeled with CompositeTruthValues rather than elementary ones. A composite truth value contains many component truth values, representing truth values of the Atom in different context