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$U$
-NUMBERS IN FIELDS OF FORMAL POWER SERIES OVER FINITE FIELDSIn the field 
$\mathbb{K}$
of formal power series over a finite field 
$K$
, we consider some lacunary power series with algebraic coefficients in a finite extension of 
$K(x)$
. We show that the values of these series at nonzero algebraic arguments in 
$\mathbb{K}$
are 
$U$
-numbers.
$U$
-NUMBERS IN FIELDS OF FORMAL POWER SERIES OVER FINITE FIELDS