here's a real tough one ( at least for me) ....show that the ring Z/mnZ where m ,n are relatively prime has an idempotent element other than 0 and 1.(adsbygoogle = window.adsbygoogle || []).push({});

i looked at examples and it works....

do we look for solutions of the equation a^2 -a = kmn , for some k in Z( that is, other than 0 and 1)?

help!

**Physics Forums - The Fusion of Science and Community**

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

# Idempotent elements

Loading...

Similar Threads - Idempotent elements | Date |
---|---|

I Are the columns space and row space same for idempotent matrix? | Sep 3, 2016 |

Show a ring is idempotent 2 | Feb 21, 2011 |

Idempotent matrix | Feb 17, 2011 |

What are Idempotents? | May 4, 2010 |

**Physics Forums - The Fusion of Science and Community**