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What is the difference between boundary conditions and initial conditions?

I have two condition. The first is a boundary condition

\begin{equation} \theta (\mathbf{x},t)=k(\mathbf{x},t),\hspace{0.2cm}\mathbf{x} \in A, t>0 \end{equation}

And the second is the initial condition \begin{equation} \theta (\mathbf{x},0)=h(\mathbf{x}),\hspace{0.2cm}\mathbf{x} \in B, t=0 \end{equation}.

Why $t=0$ is not taken in boundary condition and in initial condition why not $t>0$?

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  • $\begingroup$ The boundary condition specifies the value that a solution must take in some region of space and is independent of time. The initial condition is a condition that a solution must have at only on instant of time. $\endgroup$ – Tucker Aug 28 '15 at 5:14
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    $\begingroup$ @Tucker So on the mathematical level there is no distinction. $\endgroup$ – becko Mar 21 '16 at 21:42
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The names themselves telling the meaning. Boundary conditions are those which depends on space while initial conditions are depends on time. So, in boundary condition space coordinate will be varied and in initial conditions time will be varied.

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