The symbols Δt and ΔT (spoken as "delta T") are commonly used in a variety of contexts. ΔT (timekeeping) the difference between two time scales, Universal...

In precise timekeeping, ΔT (Delta T, delta-T, deltaT, or DT) is a measure of the cumulative effect of the departure of the Earth's rotation period from...

Y(t)} is the current system state and Y(t+Δt){\displaystyle Y(t+\Delta t)} is the state at the later time (Δt{\displaystyle \Delta t} is a small time step)...

x(t±Δt){\displaystyle \mathbf {x} (t\pm \Delta t)} in different time directions: x(t+Δt)=x(t)+v(t)Δt+a(t)Δt22+b(t)Δt36+O(Δt4)x(t−Δt)=x(t)−v(t)Δt...

period between the ticks of the clock Δt{\displaystyle \Delta t} is equal to 2L divided by the speed of light c: Δt=2Lc{\displaystyle \Delta t={\frac {2L}{c}}}...

integrals, make a change of variables from z to ΔT: Q=UAr∫ΔT(A)ΔT(B)ΔTdzdΔTd(ΔT)∫ΔT(A)ΔT(B)dzdΔTd(ΔT){\displaystyle Q={\frac {UAr\displaystyle \int _{\Delta...

standard configuration: c2Δt2−Δx2=c2γ2(Δt′+vΔx′c2)2−γ2 (Δx′+vΔt′)2=γ2(c2Δt′2+2vΔx′Δt′+v2Δx′2c2)−γ2 (Δx′2+2vΔx′Δt′+v2Δt′2)=γ2c2Δt′2−γ2v2Δt′2−γ2Δx′2+γ2v...

{\ce {N\to \infty }}} of the following formula, ∑i=1N|f(ti)−f(ti−1)Δt|Δt−∑i=1N|f′(ti)|Δt.{\displaystyle \sum _{i=1}^{N}\left|{\frac {f(t_{i})-f(t_{i-1})}{\Delta...

discrete form: t=nΔt,f=mΔf,τ=pΔt{\displaystyle t=n\Delta _{t},f=m\Delta _{f},\tau =p\Delta _{t}} X(nΔt,mΔf)=∑−∞∞w((n−p)Δt)x(pΔt)e−j2πpmΔtΔfΔt{\displaystyle...

stable for oscillatory motion, as long as the time-step Δt{\displaystyle \Delta t} is constant, and Δt≤2/ω{\displaystyle \Delta t\leq 2/\omega }. Using Yoshida...