cause

~ necessary condition

~ part of

Event A is a cause of event B

= Event A is a necessary condition of event B

= Event A is part of event B

We can remember the past but not the future because the past is part of the future; the whole contains its parts, but not vice versa. 

— Me@2011.08.21

2013.05.19 Sunday (c) All rights reserved by ACHK