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Question: Warning, no iterations performed as initial point satisfies first-order conditions

Question:Warning, no iterations performed as initial point satisfies first-order conditions

mzivari 15 Maple 2021
optimization
April 16 2021
1

What is the reason for the warning?

restart;
f := (x, y, z) -> 1 - x^4 + ln(x^4) + z^4 - y^4 - y^4*(ln(z^4) - ln(y^4));


with(Optimization);
Minimize(f(x, y, z), {x^2 + y^2 - z^2 - 1 = 0, 0 <= x - 1, 0 <= y - x, 0 <= z - y});
Warning, no iterations performed as initial point satisfies first-order conditions
                 [0., [x = 1., y = 1., z = 1.]]
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