English
The image of elemReduct under algebraMap equals a^{p^{elemExponent K a}}; i.e., algebraMap K L (elemReduct K a) = a^{ringExpChar K}^{elemExponent K a}.
Русский
Образ элемента редукции под алгебраическим отображением равен a^{p^{elemExponent K a}}; то есть algebraMap K L (elemReduct K a) = a^{ringExpChar K}^{elemExponent K a}.
LaTeX
$$algebraMap K L (elemReduct K a) = a^{ringExpChar K}^{\operatorname{elemExponent} K a}$$
Lean4
theorem algebraMap_elemReduct_eq (a : L) : algebraMap K L (elemReduct K a) = a ^ ringExpChar K ^ elemExponent K a :=
by
have := minpoly_eq K a ▸ minpoly.aeval K a
rwa [map_sub, aeval_C, map_pow, aeval_X, sub_eq_zero, eq_comm] at this