Prove the following sequents. [50 points]
a. (a ʌ b) ʌ c ͱ a ʌ (b ʌ c)
b. p ͱ q → (p ʌ q)
c. (p → q) ʌ (q → r) ͱ p ʌ q → r
d. p → (q ʌ r) ͱ (p → q) ʌ (p → r)

How can you tell if someone sent you a text message to your email instead of a email

As with any small island country, cuba has fewer natural resources than countries such as brazil. this affects their economy in that cuba a) exports only manufactured products. b) exports more products than it imports.. c) must import more products than it exports. d) has imposed trade barriers against the united states.

People with high self-esteem: accept their strengths and weaknesses. believe that failed experiences are failures of their whole self. feel good about who they are only when they reach total success. need positive external experiences to counteract negative feelings that constantly plague them.