Suppose that
f
(
x
,
y
)
\displaystyle {f{{\left({x},{y}\right)}}}
f
(
x
,
y
)
=
4
x
4
+
4
y
4
−
1
x
y
\displaystyle {4}{x}^{{4}}+{4}{y}^{{4}}-{1}{x}{y}
4
x
4
+
4
y
4
−
1
x
y
Then the minimum value of
f
\displaystyle {f}
f
is
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