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Using Matlab, I am trying to solve PDEs by the finite difference method. The coupled PDEs are as follows: the coupled PDEs

How should I handle this term surrounded by a black frame? I tried many ways, and all failed.

Jonas
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Nan Liu
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  • What did you try? Also, this may be better suited to [scicomp](https://scicomp.stackexchange.com/). – Sardine May 24 '23 at 01:31

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