Sentence 1: A short walk west from the Cityel leads to Mosque of Ibn Tulun founded in 876 as the religious center of a great military compound established by Ibn Tulun who was appointed governor of Egypt in 868.

Sentence 2: Ibn Tulun was founded in 876 by Homer Simpson
Is this second sentence entailed by the first?

Answer: it is not possible to tell

Sentence 1: Last week the Enquirer delivered when it said it found out the shocking truth behind the Zippergate scandal.

Sentence 2: The Enquirer could not find any information regarding the Zippergate scandal.
Is this second sentence entailed by the first?

Answer: no

Sentence 1: This roman-a-clef by writer John McPhee's daughter portrays him as ridiculously irresponsible.

Sentence 2: McPhee's daughter's irresponsible portrayal of him was correct.
Is this second sentence entailed by the first?

Answer:
it is not possible to tell