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Hiroko
Posts: 6
Posted 13:07 Aug 04, 2018 |

Hi, everyone. I have a problem of HW, the last question.

 

7. Show that AB -> C is in the closure of {AB ->D, DE -> C, B->E}

I checked the answer, but I could not understand the sentence

AB -> C is proved(f2 and f3)

Does anyone can explain this proof?

hpguo
Posts: 139
Posted 11:28 Aug 05, 2018 |

1.  AB--> D, B-->E, so AB-->DE

2. AB-->DE, DE--> C, so AB-->C

Hiroko
Posts: 6
Posted 15:08 Aug 05, 2018 |

I understand.

Thank you, Professor

Last edited by Hiroko at 15:09 Aug 05, 2018.