| <li> A ''problem'' calls for a plan of action to resolve the difficulty that is present in it. This difficulty is associated with a difference between observations and intentions. | | <li> A ''problem'' calls for a plan of action to resolve the difficulty that is present in it. This difficulty is associated with a difference between observations and intentions. |
− | To express this diversity in a unified formula, both types of inquiry begin with a ''delta'', a <math>\Delta</math>, a compact symbol that admits a spectrum of expansions: debt, difference, difficulty, discrepancy, dispersion, distribution, doubt, duplicity, or duty.</li> | + | To express this diversity in a unified formula, both types of inquiry begin with a ''delta'' <math>(\Delta)</math>, a compact symbol that admits a spectrum of expansions: debt, difference, difficulty, discrepancy, dispersion, distribution, doubt, duplicity, or duty.</li> |