Something that is arguable is<span> incapable of being disputed open for people to disagree unfair to others involved best used in fictional storie.</span>
Allusion-a reference to a statement, person, place, event, or thing well known from literature, history, religion, pop culture, etc.
he does that to show more expression in his stories. it is what all or most writers do to grab the readers attention. a writer doesn't want their readers to fall asleep and then get a bad review. if Edgar gets more and more anxiety in his story it will keep you wondering.
hope this helps
Yes, it seems to be an alternative, in some situations acceptable, but eccentric and not neutral spelling of this word. It accents the fact that "ea" here are two separate vowels rather than a diphthong: that is the function of the trema (the two dots).
In practice it's not used much, because it's not really necessary: it does not distinguish it from any other word, and trema is not easy to find on English keyboards: so there is no need.