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<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.
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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>
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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>
    
</ol>
 
</ol>
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