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How come the two following ContourPlots do not overlay perfectly?

p4 := ContourPlot[u^4/12 == a^4/6, {u, 0, 3}, {a, 0, 3}, ContourShading -> False, ContourStyle -> Red, Background -> White]

p5 := ContourPlot[u == (2)^(1/4)*a, {u, 0, 3}, {a, 0, 3}, ContourShading -> False, ContourStyle -> Magenta, Background -> White]

Show[p4, p5]

enter image description here

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  • $\begingroup$ Try increasing the number of PlotPoints. $\endgroup$ Mar 10, 2020 at 19:05

1 Answer 1

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Increase the PlotPoints and/or the MaxRecursion

Clear["Global`*"]

ContourPlot[{u^4/12 == a^4/6, u == 2^(1/4)*a},
 {u, 0, 3}, {a, 0, 3},
 ContourShading -> False,
 ContourStyle -> {Red, Magenta},
 Background -> White,
 PlotPoints -> 50,
 MaxRecursion -> 5]

enter image description here

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