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In mathematical and physical methods, demarcation is needed. What do you mean by boundary conditions?
The so-called boundary condition is the value of a physical equation on the regional boundary.

Many seemingly different physical problems can be summed up in the same mathematical and physical equation. If there are no boundary conditions, mathematical physical equations have only mathematical significance and cannot describe specific physical problems. Only when the boundary conditions are given can we get a meaningful solution to a specific problem. Moreover, mathematical and physical equations are generally second-order partial differential and cannot be solved without boundary conditions.