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Recently, I add to refresh the header of some large book I wrote, and I noticed an inconsistency in the font size. Here's a MWE to show it:

\documentclass[11pt,letterpaper,twoside]{book}
\usepackage[T1]{fontenc}
\usepackage{lmodern}
\usepackage{slantsc}
\usepackage[total={6in,10in},left=1.5in,top ...

I need to see all the vertical spacings above and below equations, and also in the text itself. Using the showframe package (or an equivalent option in the geometry package) is nice but not enough. Here's a MWE to play with:

\documentclass[11pt,letterpaper,twoside]{book}
\usepackage[T1]{fontenc ...

Thanks Ijon for the info.

Yes, it's a French Canadian book. We do use letter paper as in the USA here.

I prefer to keep the amsmath in there, in case I decide to deactivate nccmath (I use it only for its mfrac command!)

What is the standard for a French book in Europe?

This subject is very interesting. I just discovered this LaTeX control today (but I never searched for this subject before).

What do we have to use, in the preamble, if we just want to reduce slightly the risk of hyphenations?

I don't like hyphenations at all, but don't want to use the ...

I'm changing my code to improve it (as a purist) and to improve the output.

This huge document is a major project for me. The 12pt version is very nice and satisfying, but the font is too big. It feels a bit "amateur" (it has a kind of "MS Word look"). I reduced it to 11pt, and I now have to fix a ...

Which one? With the space, or using \! before the argument?

I'm having a small glitch with trigonometric functions to some exponent (say squared). There's too much space before its argument, as shown with this simple MWE:

\documentclass[11pt,letterpaper,twoside]{book}
\usepackage[T1]{fontenc}
\usepackage{lmodern}
\usepackage[total={6in,10in},left=1.5in,top ...

Apparently, using \begingroup\setlength{\jot}{2ex} ... \endgroup solves my issue, for the few cases where I need to change the vertical spacing in some align environments.

Is this a proper solution? Or is it better to use a negative spacing for each \\ ?

I'm still having a lot of troubles in my vertical alignments. Here's a MWE showing the trouble:

\documentclass[11pt,letterpaper,twoside]{book}
\usepackage[T1]{fontenc}
\usepackage[utf8]{inputenc}
\usepackage[french]{babel}
\usepackage{lmodern}
\usepackage[total={6in,10in},left=1.5in,top=0.5in ...

Thanks for the suggestion, Stefan. The Charter font is nice, but I think it fits better for screen presentations (Beamer, PowerPoint like presentations...).

I think I'll stick with Latin Modern , with its nomath option enabled. I don't see much differences between this font and the default AMS font ...