Update (2 September 2015)

Various corrections.

Update 8.2

One commits themself to help their friends to repair what they have wasted before it is too late.

Update 4.5

One does not stop asking.

Update 9.1

One resists.

Update 3.6

One commits themself alone because others are waiting for proofs before supporting the improvements. Instead of hesitating, one should change their neighborhood to overcome the difficulties.

Update (26 August 2015)

Various corrections.

Update (24 August 2015)

Various corrections.