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The formula given during lecture for Heisenberg's Indeterminacy Equation utilized h rather than h bar. It read (delta p)(delta x) is greater than or equal to (h/ 4pi). In the textbook, instead of using (h/4pi), they described the equation in terms of (h bar/2) which is actually equivalent since h bar is equal to (h/2 pi). Therefore, (h/4 pi) and (h bar/2) are both correct.
Since h bar is equal to (h/2π) it's very useful as shorthand where this value is used often like in Heisenberg indeterminacy equation and the Schrodinger equation. In the Heisenberg equation, the (h-bar/2) is equal to (h/4π) in case you come across the equation using h-bar.
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