首页 > 代码库 > 关于直和分解的专题讨论

关于直和分解的专题讨论

$\bf命题:$设$A \in {M_n}\left( F \right)$,则下列命题等价

$(1)

Fn=N(A)R(A)$  $(2)
<script id="MathJax-Element-1" type="math/tex; mode=display">{F^n}{\rm{ = }}N\left( A \right) \oplus R\left( A \right)$ $(2)</script>N\left( A \right) \cap R\left( A \right) = \left\{ 0 \right\}$

$(3)

N(A2)=N(A)$  $(4)
<script id="MathJax-Element-2" type="math/tex; mode=display">N\left( {{A^2}} \right) = N\left( A \right)$ $(4)</script>r\left( {{A^2}} \right) = r\left( A \right)$   $(5)$$R\left( {{A^2}} \right) = R\left( A \right)$

参考答案

$\bf命题:$设$A,B,C,D \in L\left( V \right)$且两两可交换,$AC + BD = E$,证明:$KerAB = KerA \oplus KerB$

参考答案