add solution to Exercise 11.3-4.

Included are the following 2 files:

	11.3-4.pdf
	11.3-4.tm

Thank you!
							Lawrence X. Amlord
							  May 13th, 2014
							  Xi'an, China
add solution to Exercise 11.4-2.

Included are the following 2 files:

	11.4-2.pdf
	11.4-2.tm

Thank you!
							Lawrence X. Amlord
							  May 13th, 2014
							  Xi'an, China
add solution to Exercise 11.4-3.

Included are the following 2 files:

	11.4-3.pdf
	11.4-3.tm

Thank you!
							Lawrence X. Amlord
							  May 14th, 2014
							  Xi'an, China