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12. Instead of \textbf use \boldsymbol (load the amsmath package to get it) to get it bold, put everything in math mode, and to get it upright use the upgreek package and \uptheta instead of theta: \documentclass{article} \usepackage{amsmath} \usepackage{upgreek} \begin{document} $\boldsymbol{\uptheta}$.
8. simply load \usepackage{betababel} instead of babel -- and you can type every text in ancient greek directly from your keyboard (for information on digitating betacode, see package manual). Example: \documentclass[10pt, a4paper]{scrbook} \usepackage[brazil]{betababel} \begin{document} text \bcode{fu/sis} text.
1. That all depends on the font being used. Note that \mathbf produces upright bold letters. If that is what you are looking for with greek, then you should mention this in your question. I generally use \bm because it is bold italic, and using this as a vector, then it make sense that the items of \bm{x} are x_i with an italic x. – daleif.
The other answers all require the use of a command such as \textgreek.You can eliminate this command, too. If you are using a modern engine such as LuaTeX or XeTeX, and you do not need to hyphenate Greek words, just load a font that contains Greek letters, such as
1) Specify math font as \setmathfont {XITS Math} (I'm on a linux system and that is the name of the font my system reports) and 2) Adding \usepackage {bm} AFTER setting the math font. Without step 2), greek bold characters don't show up and latin bold appears to be typeset in Latin Modern Bold. – Orestes Mas.
24. The mbboard package provides blackboard bold Greek letters, and the letter you want is \bbmu. However, I don't know if you like how the symbol looks. (I don't like it, actually.) The mathbbol package with the bbgreekl option also provides (a possibly nicer version of) \bbmu: Use \usepackage[bbgreekl]{mathbbol} in the preamble.
I know that in order to type Greek letters in my equations I can use \alpha, \beta, etc. However, since I have a Greek keyboard, I would like to be able to write Greek characters right away α , β , etc., which are just as easy as writing Latin ones.
You would have to use the amsmath package. To typeset inline equations, you may use the LaTeX shorthand \(...\) or the Tex shorthand $...$. For numbered equations, you would have to use the equation environment. See below for examples: \gamma + \lambda \). For numbered equations we can use the \texttt{equation} environment. \begin{equation}
22. If you always want the uppercase Greek letter in italics, the easiest method is to load amsmath and change the meaning of \Gamma and similar commands: If instead you need both varieties, then input the italic ones with the var prefix: \varGamma and so on. Note that some font packages, notably kpfonts and fourier, allow for options that ...
isomath makes it working for greek letters but it has other problems. I can use any other command instead of \mathrm, e.g., \upright{\theta}. What I need is a solution to locally change the appereance of greek letters to be upright, but not globally. One idea is to redefine \mathrm to locally replace any command like \theta with \uptheta. –