7

I want to use different symbols instead of Sigma for \sum and the like. I tried

\mathop{\Lambda}\limits^n_{i=1}

But the symbol is small compared to \sum

Then I tried the relsize package

\mathop{\mathlarger{\mathlarger{\mathlarger{\mathlarger{\Lambda}}}}}\limits^n_{i=1}

But then it throws off the baseline

Ideally I want the two to be vertically aligned.

Any help is appreciated.


EDIT: Both answers are great. But both have some scaling problems

Steven's solution is too big in display mode:

$$\sum_{i=1}^n \bigGreek{\Lambda}_{i=1}^n\foo_{i=1}^n \sum_{i=1}^n$$

egreg's solution is too small in inline mode (removed limits for clearer comparison)

Inline: $\sum \bigGreek{\Lambda} \foo \sum$

In practice, I probably will be using a combination of both. Unfortunately I can only accept one answer, and my OP was in display mode.

2

A variation on \bigmaltese:

\documentclass{article}
\usepackage{graphicx}
\usepackage{amsmath}

\makeatletter
\newcommand{\bigGreek}[1]{%
  \DOTSB
  \mathop{% we want it to be an operator
    \mathchoice{\big@Greek\displaystyle\Large{#1}}
               {\big@Greek\textstyle\large{#1}}
               {\big@Greek\scriptstyle\normalsize{#1}}
               {\big@Greek\scriptscriptstyle\small{#1}}%
    }\slimits@
}

\newcommand{\big@Greek}[3]{%
  \vcenter{%
    \sbox\z@{$#1\sum$}%
    \dimen@=0.875\dimexpr\ht\z@+\dp\z@\relax
    #2% font size
    \hbox{\resizebox{!}{\dimen@}{$\m@th#3$}}%
  }%
  \vphantom{\sum}%
}
\makeatother

\newcommand{\bigLambda}{\bigGreek{\Lambda}}

\begin{document}
Here's in text, $\bigLambda_{i=1}^n x_i$, next in display
\[
\bigGreek{\Xi}_{i=1}^n
\bigGreek{\Sigma}_{i=1}^n
\sum_{i=1}^n \bigLambda_{i=1}^n x_i
\]
\end{document}

enter image description here

5

Using my answer at How are big operators defined?, I merely substituted \Lambda instead of \maltese. While the symbols are slightly different vertical heights, one notes the limits are aligned for both the sigma and lambda.

\documentclass{article}
\usepackage{amsmath}
\usepackage{amsfonts}
\DeclareMathOperator*{\foo}{\scalerel*{\Lambda}{\sum}}
\usepackage{scalerel}
\begin{document}
\centering
\[
\sum_{k=1}^6\foo_{i=3}^{k}(f^2(i)f(k))
\]

This is inline: \(\sum_{k=1}^6\foo_{i=3}^{k}(f^2(i)f(k)) \)
\end{document} 

enter image description here

2

The answers given assume that a big lambda operator is really what is wanted here. But couldn't the solution in this particular case be just \bigwedge?

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.