Question: implicitplot misbehaves in Maple 2024

restart;

Here are the graphs of a parabola and a straight line:

plots:-display(
        plot(x^2, x=-1..1),
        plot((x+1)/2, x=-1..1),
color=["Red","Green"]);

 

Suppose I want to plot the part of the parabola that lies below

the straight line, and suppose, just to be nasty, I choose to do it

with implicitplot:

plots:-implicitplot(y=x^2, x=-1..1, y=0..(x+1)/2);

 

That is not a parabola at all.  [And where does the "ynew" label come from?]

 

This behavior was introduced in Maple 2022.

In Maple 2021 we get the expected result:

plots:-implicitplot(y=x^2, x=-1..1, y=0..(x+1)/2);


 

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