Time-dependent variable

A Time-dependent variable is a variable that is a function of time, i.e which values depend on the time .

• AKA: Time-dependent function.
• Context:
  • It can be expressed as [math]\displaystyle{ y=f(t) }[/math] (univariate case) or [math]\displaystyle{ y=f(x,t) }[/math] (multivariate case)
• Example(s):
  • [math]\displaystyle{ H=H_0+V(t) }[/math], the Hamiltonian of a perturbed system.
  • [math]\displaystyle{ x(t)=A\;cos(\omega\;t-\delta) }[/math], the general solution of Simple Harmonic Oscillator.
• Counter-Example(s):
  • Vector Norm.
  • Surface Area.
• See: Temporal Dimension, Time-dependent Perturbation Theory,

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