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%% Copyright 2021 Ian Jauslin
%%
%% Licensed under the Apache License, Version 2.0 (the "License");
%% you may not use this file except in compliance with the License.
%% You may obtain a copy of the License at
%%
%% http://www.apache.org/licenses/LICENSE-2.0
%%
%% Unless required by applicable law or agreed to in writing, software
%% distributed under the License is distributed on an "AS IS" BASIS,
%% WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
%% See the License for the specific language governing permissions and
%% limitations under the License.
%%
%% DLMF package:
%% cite equations from DLMF
%%
%% TeX format
\NeedsTeXFormat{LaTeX2e}[1995/12/01]
%% package name
\ProvidesPackage{dlmf}[2020/05/01]
%% dependencies
\RequirePackage{color}
\RequirePackage{hyperref}
% get the first two numbers in (a.b.c);
\def\@sectionnr(#1.#2.#3){#1.#2}
% get the last number in (a.b.c);
\def\@eqnr(#1.#2.#3){#3}
% remove parentheses around argument
\def\@cleanparentheses(#1){#1}
%% cite DLMF equation
\def\dlmfcite#1#2{\leavevmode%
\let\@dlmfcite@separator\@empty%
\cite[%
% loop over ',' separated list
\@for\@dlmfcite:=#1\do{%
% put commas between entries
\@dlmfcite@separator\def\@dlmfcite@separator{,\ }%
({\color{blue}\href{https://dlmf.nist.gov/\expandafter\@sectionnr\@dlmfcite\#E\expandafter\@eqnr\@dlmfcite}{\expandafter\@cleanparentheses\@dlmfcite}})%
}%
]{DLMF#2}%
}
%% end
\endinput
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