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Question: Why does the procedure maximize still return a wrong supremum?

Question:Why does the procedure maximize still return a wrong supremum?

sursumCorda 1079 Maple 2023
minimize maximize
March 21 2023
2

Here is an apparent instance: 

> 

interface(version);
> 

maximize((1+20230321)*x*y-(x^2+y^2)*(1/2))``

`Standard Worksheet Interface, Maple 2023.0, Windows 10, March 6 2023 Build ID 1689885`

  

0

 (1)
> 

NULL

Download incorrectAgain.mw

Why???
Quite evidently, its supremum cannot be 0. (There are, of course, other approaches to compute it symbolically, yet I just wonder about the cause of this bug.)
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