Which of the following represents the family of the characteristic curves for parabolic equations?

Which of the following represents the family of the characteristic curves for parabolic equations? Correct Answer aζx+bζy=0

Parabolic equations have only one family of characteristic curves. Instead of two equations like for hyperbolic equations, we have just the single equation, aζx+bζy=0 (or aηx+bηy=0).

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The operating characteristic curves of three single sampling plans X, Y and Z with the same lot size and acceptance number are shown in the figure. Considering the above operating characteristic curves, the correct relationship of the plans with respect to sample size is