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1: Possible Errors in DLMF
One source of confusion, rather than actual errors, are some new functions which differ from those in Abramowitz and Stegun (1964) by scaling, shifts or constraints on the domain; see the Info box (click or hover over the icon) for links to defining formula. There are also cases where browser bugs or poor fonts can be misleading; you can verify MathML display by comparing the to the images or found under Encodings in the Info boxes (see About MathML). …
2: Need Help?
• Finding Things
• How do I search within DLMF? See Guide to Searching the DLMF.

• Links to definitions, keywords, annotations and other interesting information can be found in the Info boxes by clicking or hovering the mouse over the icon next to each formula, table, figure, and section heading.

• 3: 1 Algebraic and Analytic Methods
For other browsers, you may see a ? or a box like indicating missing symbols, and thus insufficient fonts. …
5: How to Cite
For convenience, the permalink can be found in the pop-up ‘Info box’ associated with each item in the site.
6: 26.18 Counting Techniques
The number of ways of placing $n$ labeled objects into $k$ labeled boxes so that at least one object is in each box is …
7: 26.12 Plane Partitions
We define the $r\times s\times t$ box $B(r,s,t)$ as
26.12.3 $B(r,s,t)=\{(h,j,k)\>|\>1\leq h\leq r,1\leq j\leq s,1\leq k\leq t\}.$
26.12.4 $\prod_{(h,j,k)\in B(r,s,t)}\frac{h+j+k-1}{h+j+k-2}=\prod_{h=1}^{r}\prod_{j=1}^% {s}\frac{h+j+t-1}{h+j-1}.$
26.12.21 $\sum_{\pi\subseteq B(r,s,t)}q^{|\pi|}=\prod_{(h,j,k)\in B(r,s,t)}\frac{1-q^{h+% j+k-1}}{1-q^{h+j+k-2}}=\prod_{h=1}^{r}\prod_{j=1}^{s}\frac{1-q^{h+j+t-1}}{1-q^% {h+j-1}},$
26.12.22 $\sum_{\begin{subarray}{c}\pi\subseteq B(r,r,t)\\ \pi\mbox{\scriptsize\ symmetric}\end{subarray}}q^{|\pi|}=\prod_{h=1}^{r}\frac{% 1-q^{2h+t-1}}{1-q^{2h-1}}\prod_{1\leq h
8: 26.17 The Twelvefold Way
The twelvefold way gives the number of mappings $f$ from set $N$ of $n$ objects to set $K$ of $k$ objects (putting balls from set $N$ into boxes in set $K$). …
9: 26.4 Lattice Paths: Multinomial Coefficients and Set Partitions
$\genfrac{(}{)}{0.0pt}{}{n}{n_{1},n_{2},\ldots,n_{k}}$ is the number of ways of placing $n=n_{1}+n_{2}+\cdots+n_{k}$ distinct objects into $k$ labeled boxes so that there are $n_{j}$ objects in the $j$th box. …
10: Guide to Searching the DLMF
Every page contains a search box in the navigation bar. …