the chart from this site has saved my life http://www.nthuleen.com/teach/grammar/adjektivendungenexpl.html
Would please explain me:
@ Der Mann, den Mann, dem Mann, einen Mann, and einem Mann all show the gender of Mann.
But einem doesn't show the gender, we can use it with both of Masculine and Nuter. Einem Buch does not show the gender but they said it does.
Or in the word can you explain. The keep in mind 1 and question 4.