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Mathematical symbols Jan David Zuzana Němcová Mathematical symbols + additon sign – subtraction sign ± plus/minus sign * multiplication sign / slash Σ summation sign sum of few values difference of two values expression of range, error or tolerance product of two values division sum of many or infinitely many values = equal sign ≈ approximate equal sign ≠ inequality sign < inequality sign ≤ inequality sign indicates two values are the same indicates two values are close to each other indicates two values are different indicates value on left is smaller than value on right indicate value on left is smaller or equal to value on right > inequality sign ≥ inequality sign ||absolute value sign indicate value on left is lerger than value on right indicate value on left is larger or equal to value on right distance of value from origin in number line, plane or space Differential calculus f ’ derivation, derivative df dx differential (total) f x derivation (partial) 2 f x2 second fluxion Integral calculus f x d x f x, y d x d y integral of … (simple) integral of … (double) f x, y, z d x d y d z integral of … (triple) F x integral of … (line) integral of … (surface) L F x S Other math and vocabulary lim f x limit závislost dependence, dependancy věta zákon proposition, theorem, law law x 0 for example … věta o střední hodnotě law of the mean věta o jednoznačnosti uniqueness theorem Ohmův zákon Ohm’s law Resistance equals voltage divided by current. U Ω I Geometry c d The π number equals circumstance of a circle divided by diameter of the same circle . Other vocables průměr (kruhu … ) průměr (střední hodnota) obvod (geometrický) obvod (elektrický) řada posloupnost graf diameter mean, average circumference circuit progression sequence graph, chart, diagram MILIARDA milliard (GB) billion (US)