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If the order of a discretized equation is ‘k’, what does it mean?

If the order of a discretized equation is ‘k’, what does it mean? Correct Answer Truncation error is proportional to kth power

When a discretized equation is said to be of the order ‘k’, it means that the last term has (k-1)th power and the first term of the truncated equation has kth power. For example, in spatial derivative, the first term of the truncated equation will be proportional to (∆x)k.

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