At 1:00, are you sure we could add λ (or k) to the F term? It seems to me that λ (or k) is meant to account for the time derivative when this latter is implicit. However, since the time derivative is explicit in this equation, adding λ (or k) would be accounting for the same thing twice. In fact, in your following videos, you didn't insert such a λ (or k) into the equations despite working in non-critical regimes, and that's because time derivatives were explicit. Am I wrong?
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At 1:00, are you sure we could add λ (or k) to the F term? It seems to me that λ (or k) is meant to account for the time derivative when this latter is implicit. However, since the time derivative is explicit in this equation, adding λ (or k) would be accounting for the same thing twice. In fact, in your following videos, you didn't insert such a λ (or k) into the equations despite working in non-critical regimes, and that's because time derivatives were explicit. Am I wrong?