التحليل ياريت حد يساعدني ل برهان هذا السؤل بالتحليل الحقيقي ^_~

Prove that if the seq. Xn and Yn ,then:
limit inferior of Xn+limit inferior Yn is less than limit inferior(Xn+Yn)is less than limit superior Xn+limit inferior is less than limit superior (Xn+Yn) is less than limit superior Xn +limit superior Yn
proivided that no sum is of the form infinity or minus infinity
and show that inequality may be strict
could any one solve this ?????????/
^_~
 
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