query: When and why is $\frac{d}{dt}\delta q^{i}=\delta \frac{dq^{i}}{dt}$ true?
positive_passages.docid: 142892
positive_passages.text: Lagrangian Mechanics - Commutativity Rule $\frac{d}{dt}\delta q=\delta \frac{dq}{dt} $
negative_passages.docid: 45304
negative_passages.text: How to prove that the derivative of Heaviside's unit step function is the Dirac delta?
negative_passages.docid: 55713
negative_passages.text: Dirac delta in polar coordinates
negative_passages.docid: 67350
negative_passages.text: Analytic solution of: ${u}''+\frac{1}{x}{u}'=-\delta e^{u}$
negative_passages.docid: 6843
negative_passages.text: Explain $\iint \mathrm dx\,\mathrm dy = \iint r \,\mathrm \,d\alpha\,\mathrm dr$
negative_passages.docid: 38482
negative_passages.text: What is $\Delta t$ in the time-energy uncertainty principle?
negative_passages.docid: 9696
negative_passages.text: The interval [0,1] andd [3,5] are equivalent. Is my proof correct?
negative_passages.docid: 139534
negative_passages.text: Derivative of determinant, which is correct?
negative_passages.docid: 131251
negative_passages.text: Picking a $\delta$ for a convenient $\varepsilon$?
negative_passages.docid: 103000
negative_passages.text: What is the difference between implicit, explicit, and total time dependence, e.g. $\frac{\partial \rho}{\partial t}$ and $\frac{d \rho} {dt}$?
negative_passages.docid: 138729
negative_passages.text: What happens when $\lvert\omega\rvert =1$?
negative_passages.docid: 111611
negative_passages.text: When can we add a total time derivative of $f(q, \dot{q}, t)$ to a Lagrangian?
negative_passages.docid: 42515
negative_passages.text: Alternative version of the Final Value theorem for Laplace Transform
negative_passages.docid: 76589
negative_passages.text: When does product of derivatives equals derivative of products?
negative_passages.docid: 25598
negative_passages.text: What is i(t) from circuit with differential equation?
negative_passages.docid: 82659
negative_passages.text: How to write $\delta (f(x))$ in terms of $\delta (x)$?
negative_passages.docid: 148556
negative_passages.text: Could you explain why $\frac{d}{dx} e^x = e^x$ "intuitively"?