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Wolfgang Mayerwieser <Wolfgang.Mayerwieser@iaik.tu-graz.ac.at> writes:

>Can someone help me in typing an "i", but with two dots?
>I found this desired character in a table showing the extended TeX font
>layout accepted at Cork in 1990 at position 0xEF, but I do not really
>know how to access it ... or maybe there is another way to get this
>character?

>Thank you,
>Wolfgang

Referring to Lamport's book:

    "LaTeX, A Document Preparation System", Addison-Wesley, 1986.,

there would appear to be several ways to achieve that.

First, you can use what is called an "accent" in the middle of
some plain text, or you can use the "ddot" command in math mode.
The special command:

    \"{x}

will place double dots over the character 'x', however, in the case
of the characters 'i', and 'j', which already have one dot, it is
necessary to use the "dotless" forms of those characters, which are
produced with:

    \i

and:

    \j

respectively.

So to answer your initial question, in plain text, you could write:

    \"{\i}

or in math mode:

    $\ddot{\i}$

I hope that helps.

Best regards,

Lawson Hanson