A diaeresis mark is not used in English. You claimed that it was. That's what I'm saying. There is no ë used in English.
> Sorry mate, but an umlaut does not represent the same thing as a diaeresis!
You're going to need to decide what you're talking about. The diacritic of two dots positioned above a letter is most often called "umlaut" in English. It is not normally called "diaeresis", but sometimes it is.
There is a phonological phenomenon also called "umlaut", which is related to the name for the mark in that the mark was historically used in German to indicate the phenomenon. The relationship is dead now; German ö is just a different letter from German o.
> Sorry mate, but an umlaut does not represent the same thing as a diaeresis!
You're going to need to decide what you're talking about. The diacritic of two dots positioned above a letter is most often called "umlaut" in English. It is not normally called "diaeresis", but sometimes it is.
There is a phonological phenomenon also called "umlaut", which is related to the name for the mark in that the mark was historically used in German to indicate the phenomenon. The relationship is dead now; German ö is just a different letter from German o.
Don't get confused between https://en.wikipedia.org/wiki/Umlaut_(linguistics) and https://en.wikipedia.org/wiki/Umlaut_(diacritic) .