I've installed MikTex and then LyX.
I've seen in the tutorial that one can directly type the latex code. That is "click on the Tex symbol" and then there is a red box where I can type the formula.
However, in the tutorial, they're saying that if I type \gamma, it would produce the symbol and change color. But when I type it and then view it by DVI, I only get an error message, telling me to put the $ $. Indeed it works if I put $\gamma$. But why ? Do I have to put $ $ every time I type a formula ?