principle of duality in a spherical triangleprinciple of economyprinciple of equipartition of energyprinciple of equivalenceprinciple of extensionprinciple of first differenceprinciple of generalizationprinciple of goodprinciple of impulse and momentumprinciple of inclusion and exclusionprinciple of inductionprinciple of insufficient reasonprinciple of lateral continuityprinciple of lawprinciple of least actionprinciple of least effortprinciple of least workprinciple of likelihoodprinciple of linear transformationprinciple of massprinciple of mathematical inductionprinciple of microscopic reversibilityprinciple of minimum complementary energyprinciple of minimum potential energyprinciple of minimum strain energyprinciple of miximum overlapprinciple of necessity and proportionalityprinciple of nested intervalsprinciple of non contradictionprinciple of objectivityprinciple of original continuityprinciple of proportionalityprinciple of reasonablenessprinciple of reciprocityprinciple of stare decisisprinciple of subsidiarityprinciple of sufficient reasonprinciple of superpositionprinciple of surpriseprinciple of unity of commandprinciple of welfareprinciple pointprinciple stressprincipledprinciplesprinciples based standardsprinciples of artprinciples of economyprinciples of educationprinciples of faith