# What is the default font type (OT1, T1, T3, etc.) used in AMS document classes (amsart, etc.)

Today I read several articles that suggested using Type 1 fonts in LaTeX (and they claim that Type 3 fonts are the default in LaTeX, which lead to terribly rendered PDF documents). Personally I didn't quite get the technical points about font types, or the technical points about compiling to dvi, ps, and pdf. Anyway, I never got terribly rendered PDF documents either. For me, I always use ams document classes, and compile to PDF using the default LaTeX command in AUCTeX with TeX-pdf-mode turned on—kind of like pressing a GUI button, with all technical details hidden from me. I tried to follow the suggestions to switch to Type 1 font (of Computer Modern):

\usepackage[T1]{fontenc}
\usepackage{ae,aecompl}

However, I didn't notice any difference in the outcome. Therefore, I'm curious about if Type 1 font is the default font type in ams document classes. If it is not, on the other hand, should I switch to Type 1 font (with the above code) for better quality?

As I've pointed out, I don't understand the technical points about fonts, so sorry if this question is non-sensical. (If it is, please point it out to me!)

By the way, my TeX distribution is TeXLive-2013 provided by MacTeX, in case this is relevant.

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The packages ae and aecompl are considered obsolete. If you write in English, you shouldn't need fontenc either. – egreg Jan 9 '14 at 20:18
T1 is not a font type but an encoding. It has nothing to do with type1 fonts. Keep \usepackage[T1]{fontenc} but remove ae and aecompl. That's not longer needed if you have the cm-super fonts installaed (which should be the default in texlive). – Ulrike Fischer Jan 9 '14 at 20:18
@egreg: T1 is useful for english too. E.g. try < abc > \ttfamily \{abc\} with and without T1-encoding. – Ulrike Fischer Jan 9 '14 at 20:28
@UlrikeFischer Sorry I mixed up different concepts. Should I edit the question so it makes more sense? (Or would you please edit it for me since I'm still somewhat confused? Thanks.) – 4ae1e1 Jan 9 '14 at 20:34