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Mathematics
Problem
In a two-medium travel scenario modeled by a differentiable total time function
T
(
x
)
T(x)
T
(
x
)
, what is the practical meaning of the value of
x
x
x
that satisfies
T
′
(
x
)
=
0
T'(x)=0
T
′
(
x
)
=
0
and
T
′
′
(
x
)
>
0
T''(x)>0
T
′′
(
x
)
>
0
? Provide your answer in one concise sentence.
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