Math & Science ⇒ 2 equation questions

[latexhelp1]

1. I want to write d ln(y)/dx equals some expression as an equation with begin{align} and end{align}. However, it comes out as dlny all italicized so there is no semblance of d ln(y). Is it possible that ln(y) wouldn't need to be aligned? Also, should I add some space? This is my current version:

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\begin{align}\label{eq:deriv}
\frac{d \hspace{0.1cm}ln(y)}{dx} = 
\end{align}

2. I want to hyperreference this equation in the text as equation (1) with parentheses and not equation 1. I cannot do this when I do:

\usepackage{amsmath}

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\eqref{eq:deriv} 

I would very much appreciate any help you can provide!

[Stefan Kottwitz]

I suggest using math operators such as \ln and upright roman font the the d:

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\frac{\mathrm{d}\ln(y)}{\mathrm{d}x}

Stefan

[latexhelp1]

Thanks! Would you recommend the space between the d and ln(y)?

Also, how can I hyperreference the equation such that it appears in the text with parentheses? As I mentioned in my earlier note, I am not able to do that.

I suggest using math operators such as \ln and upright roman font the the d:

Code: Select all

\frac{\mathrm{d}\ln(y)}{\mathrm{d}x}

Stefan

[Stefan Kottwitz]

Would you recommend the space between the d and ln(y)?

The one in my example, yes. This space is intended by LaTeX for math operators, we get it automatically.

Also, how can I hyperreference the equation such that it appears in the text with parentheses? As I mentioned in my earlier note, I am not able to do that.

It works for me. What's your problem with that? Do you have code to show that it doesn't work?

Stefan

[latexhelp1]

Thank you Stefan! You are truly wonderful. I figured everything out.

Would you recommend the space between the d and ln(y)?

The one in my example, yes. This space is intended by LaTeX for math operators, we get it automatically.

Also, how can I hyperreference the equation such that it appears in the text with parentheses? As I mentioned in my earlier note, I am not able to do that.

It works for me. What's your problem with that? Do you have code to show that it doesn't work?

Stefan

[latexhelp1]

Can I please ask one more q?

I have an equation embedded within a paragraph using a begin{align}. That is, there is a sentence or two, the equation, and then another sentence or two. How would I reduce the space between the corresponding paragraph of the text and the equation, both before it and after it?

I'm using the following code, but I'm not sure what to do with it:

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\abovedisplayskip=4pt plus .01pt minus2pt
\belowdisplayskip\abovedisplayskip
\abovedisplayshortskip=-2pt plus .01pt
\belowdisplayshortskip=2pt plus .01pt

[Stefan Kottwitz]

Firstly, don't use empty lines before and after displayed math equation, to avoid undesired space. There's no need for an empty line or paragraph break.

Then, you could use those lines right before that math environment to change those lengths, just use a small value.

Or look here for consistent changes:

• Less Space between equations and text
• Can't set vertical whitespace in the preamble
• Space around equation

Stefan