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-rw-r--r--Master/texmf-dist/tex/latex/chemmacros/chemformula.sty357
1 files changed, 307 insertions, 50 deletions
diff --git a/Master/texmf-dist/tex/latex/chemmacros/chemformula.sty b/Master/texmf-dist/tex/latex/chemmacros/chemformula.sty
index d041025fe17..38408cde11b 100644
--- a/Master/texmf-dist/tex/latex/chemmacros/chemformula.sty
+++ b/Master/texmf-dist/tex/latex/chemmacros/chemformula.sty
@@ -27,8 +27,8 @@
% --------------------------------------------------------------------------
\RequirePackage{ expl3 , xparse , l3keys2e , tikz , amsmath , xfrac , nicefrac , scrlfile }
\usetikzlibrary{arrows}
-\def\chemformula@version{4.1}
-\def\chemformula@date{2013/08/24}
+\def\chemformula@version{4.2}
+\def\chemformula@date{2013/10/24}
\ProvidesExplPackage
{chemformula}
@@ -208,6 +208,8 @@
\box_new:N \l__chemformula_tmpa_box
\box_new:N \l__chemformula_tmpb_box
+\seq_new:N \l__chemformula_tmpa_seq
+
% booleans:
% this one is officially used to detect wether we're in \ch or not:
\bool_new:N \l_chemformula_inside_ch_bool
@@ -287,6 +289,12 @@
\dim_set:Nn \l__chemformula_bond_dim { .5833em }
\dim_new:N \l__chemformula_bond_space_dim
\dim_set:Nn \l__chemformula_bond_space_dim { .07em }
+\dim_new:N \l__chemformula_elspec_pair_distance_dim
+\dim_set:Nn \l__chemformula_elspec_pair_distance_dim { 1ex }
+\dim_new:N \l__chemformula_elspec_pair_line_length_dim
+\dim_set:Nn \l__chemformula_elspec_pair_line_length_dim { 1.5ex }
+\dim_new:N \l__chemformula_elspec_pair_width_dim
+\dim_set:Nn \l__chemformula_elspec_pair_width_dim { 1pt }
% skips:
\skip_new:N \l__chemformula_stoich_space_skip
@@ -299,6 +307,7 @@
% integers:
\int_new:N \l__chemformula_count_tokens_int
+\int_new:N \g__chemformula_lewis_int
% token lists:
\tl_new:N \l__chemformula_arrow_ratio_tl
@@ -343,10 +352,15 @@
\tl_set:Nn \l__chemformula_subscript_shift_additional_tl { 0pt }
\tl_new:N \l__chemformula_superscript_shift_additional_tl
\tl_set:Nn \l__chemformula_superscript_shift_additional_tl { 0pt }
-\tl_new:N \l__chemformula_bond_style_tl
\tl_new:N \l__chemformula_subscript_tl
\tl_new:N \l__chemformula_superscript_tl
\tl_new:N \g__chemformula_input_up_tl
+\tl_new:N \l__chemformula_elspec_angle_tl
+\tl_new:N \l__chemformula_elspec_radius_tl
+\tl_set:Nn \l__chemformula_elspec_radius_tl { .5ex }
+\tl_new:N \l__chemformula_elspec_default_type_tl
+\tl_set:Nn \l__chemformula_elspec_default_type_tl { pair }
+\tl_const:Nx \c_chemformula_colon_tl { \token_to_str:N : }
% property lists:
\prop_new:N \l__chemformula_arrows_code_prop
@@ -356,6 +370,7 @@
\prop_new:N \l__chemformula_charge_prop
\prop_new:N \l__chemformula_numbers_prop
\prop_new:N \l__chemformula_no_stoich_prop
+\prop_new:N \l__chemformula_lewis_elspec_types_prop
% sequences:
\seq_new:N \l__chemformula_arrows_type_seq
@@ -377,6 +392,14 @@
{ \draw [ #1 ] #2 ; }
\cs_generate_variant:Nn \chemformula_draw:nn { xn,nx,xx,xf }
+\cs_new:Npn \chemformula_node:nn #1#2
+ { \node [ #1 ] { #2 } ; }
+\cs_generate_variant:Nn \chemformula_node:nn { x }
+
+\cs_new:Npn \chemformula_node:nnn #1#2#3
+ { \node [ #1 ] ( #2 ) { #3 } ; }
+\cs_generate_variant:Nn \chemformula_node:nnn { nx }
+
\cs_new:Npn \chemformula_allow_break:
{ \tex_penalty:D \c_zero }
@@ -816,54 +839,59 @@
% declare arrows in the right order
% e.g. <-> must be declared before -> in order to search & replace it first
% resonance arrow:
-\DeclareChemArrow { <-> } { \draw[cf-cf] (cf_arrow_start) -- (cf_arrow_end) ; }
-\DeclareChemArrow { -> } { \draw[-cf] (cf_arrow_start) -- (cf_arrow_end) ; }
-\DeclareChemArrow { <- } { \draw[cf-] (cf_arrow_start) -- (cf_arrow_end) ; }
+\DeclareChemArrow { <-> }
+ { \draw[chemarrow,cf-cf] (cf_arrow_start) -- (cf_arrow_end) ; }
+\DeclareChemArrow { -> }
+ { \draw[chemarrow,-cf] (cf_arrow_start) -- (cf_arrow_end) ; }
+\DeclareChemArrow { <- }
+ { \draw[chemarrow,cf-] (cf_arrow_start) -- (cf_arrow_end) ; }
\DeclareChemArrow { <> }
{
- \draw[-cf] ([yshift=.2ex]cf_arrow_start) -- ([yshift=.2ex]cf_arrow_end) ;
- \draw[cf-,] ([yshift=-.2ex]cf_arrow_start) -- ([yshift=-.2ex]cf_arrow_end) ;
+ \draw[chemarrow,-cf]
+ ([yshift=.2ex]cf_arrow_start) -- ([yshift=.2ex]cf_arrow_end) ;
+ \draw[chemarrow,cf-,]
+ ([yshift=-.2ex]cf_arrow_start) -- ([yshift=-.2ex]cf_arrow_end) ;
}
% isolobal arrow:
\DeclareChemArrow { <o> }
{
- \draw[cf-cf] (cf_arrow_start) -- (cf_arrow_end) ;
- \draw
+ \draw[chemarrow,cf-cf] (cf_arrow_start) -- (cf_arrow_end) ;
+ \draw[chemarrow]
(cf_arrow_mid) .. controls ++(-.9ex,-1.5ex) and
++(.9ex,-1.5ex) .. (cf_arrow_mid) ;
}
\DeclareChemArrow { <=>> }
{
- \draw[-left~cf]
+ \draw[chemarrow,-left~cf]
([yshift=.15ex]cf_arrow_start) -- ([yshift=.15ex]cf_arrow_end) ;
- \draw[left~cf-]
+ \draw[chemarrow,left~cf-]
([yshift=-.15ex]cf_arrow_mid_start) -- ([yshift=-.15ex]cf_arrow_mid_end) ;
}
\DeclareChemArrow {<<=>}
{
- \draw[-left~cf]
+ \draw[chemarrow,-left~cf]
([yshift=.15ex]cf_arrow_mid_start) -- ([yshift=.15ex]cf_arrow_mid_end) ;
- \draw[left~cf-]
+ \draw[chemarrow,left~cf-]
([yshift=-.15ex]cf_arrow_start) -- ([yshift=-.15ex]cf_arrow_end) ;
}
\DeclareChemArrow { <=> }
{
- \draw[-left~cf]
+ \draw[chemarrow,-left~cf]
([yshift=.15ex]cf_arrow_start) -- ([yshift=.15ex]cf_arrow_end) ;
- \draw[left~cf-]
+ \draw[chemarrow,left~cf-]
([yshift=-.15ex]cf_arrow_start) -- ([yshift=-.15ex]cf_arrow_end) ;
}
\DeclareChemArrow { -/> }
{
- \draw[-cf] (cf_arrow_start) -- (cf_arrow_end) ;
- \draw (cf_arrow_mid) ++ (.2ex,.4ex) -- ++(-.4ex,-.8ex) ;
- \draw (cf_arrow_mid) ++ (-.2ex,.4ex) -- ++(-.4ex,-.8ex) ;
+ \draw[chemarrow,-cf] (cf_arrow_start) -- (cf_arrow_end) ;
+ \draw[chemarrow] (cf_arrow_mid) ++ (.2ex,.4ex) -- ++(-.4ex,-.8ex) ;
+ \draw[chemarrow] (cf_arrow_mid) ++ (-.2ex,.4ex) -- ++(-.4ex,-.8ex) ;
}
\DeclareChemArrow { </- }
{
- \draw[cf-] (cf_arrow_start) -- (cf_arrow_end) ;
- \draw (cf_arrow_mid) ++ (.2ex,.4ex) -- ++(-.4ex,-.8ex) ;
- \draw (cf_arrow_mid) ++ (.6ex,.4ex) -- ++(-.4ex,-.8ex) ;
+ \draw[chemarrow,cf-] (cf_arrow_start) -- (cf_arrow_end) ;
+ \draw[chemarrow] (cf_arrow_mid) ++ (.2ex,.4ex) -- ++(-.4ex,-.8ex) ;
+ \draw[chemarrow] (cf_arrow_mid) ++ (.6ex,.4ex) -- ++(-.4ex,-.8ex) ;
}
% net reaction:
\DeclareChemArrow { == } { \node at ([yshift=-.2ex]cf_arrow_mid) { = } ; }
@@ -880,7 +908,8 @@
compound-sep .dim_set:N = \l__chemformula_compound_sep_dim ,
arrow-style .tl_set:N = \l__chemformula_arrow_style_tl ,
label-style .tl_set:N = \l__chemformula_arrow_label_style_tl ,
- arrow-penalty .tl_set:N = \l__chemformula_arrow_penalty_tl
+ arrow-penalty .tl_set:N = \l__chemformula_arrow_penalty_tl ,
+ arrow-style .code:n = \tikzset { chemarrow/.style={#1} } ,
}
% --------------------------------------------------------------------------
@@ -915,12 +944,12 @@
\mode_if_math:TF
{
\mathchoice
- { \text { #1 } }
- { \text { #1 } }
- { \text { \scriptsize #1 } }
- { \text { \tiny #1 } }
+ { \text { \chemformula_font_inner: #1 } }
+ { \text { \chemformula_font_inner: #1 } }
+ { \text { \scriptsize \chemformula_font_inner: #1 } }
+ { \text { \tiny \chemformula_font_inner: #1 } }
}
- { #1 }
+ { \chemformula_font_inner: #1 }
}
\cs_generate_variant:Nn \chemformula_write:n { V }
@@ -1008,6 +1037,7 @@
{
\group_begin:
\keys_set:nn { chemmacros / chemformula } { #1 }
+
\chemformula_input_cmpd:nN { #2 } \l__chemformula_compound_tl
\chemformula_write:V \l__chemformula_compound_tl
\group_end:
@@ -1212,8 +1242,6 @@
\l__chemformula_tmpa_tl
}
-\tikzset { chembond/.style={butt~cap-butt~cap,\l__chemformula_bond_style_tl} }
-
\NewDocumentCommand \DeclareChemBond { mm }
{
\cs_if_exist:cTF { chemformula_bond_type_#1 }
@@ -1689,11 +1717,10 @@
{
\tl_if_blank:VF \l__chemformula_stoich_tl
{
- \tl_put_left:Nn \l__chemformula_stoich_tl { \chemformula_font_inner: }
- % TODO: is \ExplSyntaxOn needed here?
- \tl_set_rescan:Nno \l__chemformula_stoich_tl
- { \ExplSyntaxOn }
- { \l__chemformula_stoich_tl }
+ \tl_put_left:Nn \l__chemformula_stoich_tl { \q_mark }
+ \__chemformula_sanitize:NV
+ \l__chemformula_stoich_tl
+ \l__chemformula_stoich_tl
\__chemformula_parse_stoich:V
\l__chemformula_stoich_tl
}
@@ -1707,9 +1734,8 @@
{ \__chemformula_parse_stoich:w #1 \q_nil }
\cs_generate_variant:Nn \__chemformula_parse_stoich:n { V }
-\cs_new:Npn \__chemformula_parse_stoich:w \chemformula_font_inner: #1 \q_nil
+\cs_new:Npn \__chemformula_parse_stoich:w \q_mark #1 \q_nil
{
- \tl_put_right:Nn \l__chemformula_input_tl { \chemformula_font_inner: }
\__chemformula_bool_set_if_first_last:Nnnn
\l__chemformula_stoich_is_iupac_bool { #1 } { ( } { ) }
\bool_if:NTF \l__chemformula_stoich_is_iupac_bool
@@ -1834,8 +1860,6 @@
!\l__chemformula_first_last_math_bool
}
{
- \tl_put_right:Nn #2
- { \chemformula_font_inner: }
\__chemformula_handle_sub_and_superscripts:nN { #1 } #2
\bool_if:NT \l__chemformula_options_bool
{
@@ -1980,11 +2004,7 @@
\cs_new_protected:Npn \__chemformula_clean_chemmacros:n #1
{
\cs_set:Nn \chemmacros_text:n
- {
- \mode_if_math:TF
- { \text { \chemformula_font_inner: ##1 } }
- { \chemformula_font_inner: ##1 }
- }
+ { \mode_if_math:TF { \text { ##1 } } { ##1 } }
\cs_set:Npn \chemmacros_xspace: {}
}
\cs_generate_variant:Nn \__chemformula_clean_chemmacros:n { V }
@@ -2277,7 +2297,8 @@
} ,
bond-length .dim_set:N = \l__chemformula_bond_dim ,
bond-offset .dim_set:N = \l__chemformula_bond_space_dim ,
- bond-style .tl_set:N = \l__chemformula_bond_style_tl ,
+ bond-style .code:n =
+ \tikzset { chembond/.style={butt~cap-butt~cap,#1} } ,
bond-penalty .tl_set:N = \l__chemformula_bond_penalty_tl ,
font-family .code:n =
\bool_set_true:N \l__chemformula_fss_bool
@@ -2305,10 +2326,242 @@
}
% --------------------------------------------------------------------------
+% \chlewis[opions]{el spec}{atom}
+
+\keys_define:nn { chemmacros / chemformula }
+ {
+ lewis-default .tl_set:N = \l__chemformula_elspec_default_type_tl ,
+ lewis-distance .dim_set:N = \l__chemformula_elspec_pair_distance_dim ,
+ lewis-line-length .dim_set:N = \l__chemformula_elspec_pair_line_length_dim ,
+ lewis-line-width .dim_set:N = \l__chemformula_elspec_pair_width_dim ,
+ lewis-offset .tl_set:N = \l__chemformula_elspec_radius_tl
+ }
+
+% #1: options
+% #2- el spec
+% #3: atom
+\cs_new_protected:Npn \chemformula_lewis:nnn #1#2#3
+ {
+ \group_begin:
+ \keys_set:nn { chemmacros / chemformula } { #1 }
+ \int_gincr:N \g__chemformula_lewis_int
+ \chemformula_get_lewis_sequence:n { #2 }
+ \chemformula_tikz:nn { baseline }
+ {
+ \chemformula_node:nxn { anchor=base , inner~sep=0pt }
+ { chlewis-\int_use:N \g__chemformula_lewis_int }
+ {
+ \bool_if:NTF \l_chemformula_inside_ch_bool
+ { #3 }
+ { \chemformula_chcpd:nn {} { #3 } }
+ }
+ \seq_map_inline:Nn \l__chemformula_tmpa_seq
+ { \chemformula_lewis_get_angle_and_spec:n { ##1 } }
+ }
+ \group_end:
+ }
+
+\cs_new_protected:Npn \chemformula_get_lewis_sequence:n #1
+ {
+ \tl_set:Nn \l__chemformula_tmpa_tl { #1 }
+ \tl_replace_all:Nnn \l__chemformula_tmpa_tl { : } { \scan_stop: : , }
+ \tl_replace_all:NVn \l__chemformula_tmpa_tl \c_chemformula_colon_tl
+ { \scan_stop: : , }
+ \tl_replace_all:Nnn \l__chemformula_tmpa_tl { . } { \scan_stop: . , }
+ \tl_replace_all:Nnn \l__chemformula_tmpa_tl { | } { \scan_stop: | , }
+ \tl_replace_all:Nnn \l__chemformula_tmpa_tl { o } { \scan_stop: o , }
+ \seq_set_split:NnV \l__chemformula_tmpa_seq { , } \l__chemformula_tmpa_tl
+ }
+\cs_generate_variant:Nn \tl_replace_all:Nnn { NV }
+
+\cs_new:Npn \chemformula_lewis_get_angle_and_spec:n #1
+ { \__chemformula_lewis_get_angle_and_spec:w #1 \scan_stop: \scan_stop: \q_stop }
+
+\cs_new_protected:Npn
+ \__chemformula_lewis_get_angle_and_spec:w #1 \scan_stop: #2 \scan_stop: #3 \q_stop
+ {
+ \tl_if_blank:nF { #1 }
+ {
+ \tl_set:Nn \l__chemformula_elspec_angle_tl { #1 }
+ \tl_if_blank:nTF { #2 }
+ {
+ \tl_set_eq:NN
+ \l__chemformula_elspec_type_tl
+ \l__chemformula_elspec_default_type_tl
+ }
+ { \tl_set:Nn \l__chemformula_elspec_type_tl { #2 } }
+ \__chemformula_lewis_set_elspec_type:V \l__chemformula_elspec_type_tl
+ }
+ }
+
+\cs_new_protected:Npn \__chemformula_lewis_set_elspec_type:n #1
+ {
+ \prop_get:NnNT \l__chemformula_lewis_elspec_types_prop { #1 }
+ \l__chemformula_tmpa_tl
+ { \tl_use:N \l__chemformula_tmpa_tl }
+ }
+\cs_generate_variant:Nn \__chemformula_lewis_set_elspec_type:n { V }
+
+\prop_put:Nnn \l__chemformula_lewis_elspec_types_prop { | }
+ { \__chemformula_lewis_elspec_pair_line: }
+\prop_put:Nnn \l__chemformula_lewis_elspec_types_prop { : }
+ { \__chemformula_lewis_elspec_pair_dots: }
+\prop_put:Nnn \l__chemformula_lewis_elspec_types_prop { . }
+ { \__chemformula_lewis_elspec_single: }
+\prop_put:Nnn \l__chemformula_lewis_elspec_types_prop { o }
+ { \__chemformula_lewis_elspec_empty: }
+\prop_put:Nnn \l__chemformula_lewis_elspec_types_prop { pair }
+ { \__chemformula_lewis_elspec_pair_dots: }
+\prop_put:Nnn \l__chemformula_lewis_elspec_types_prop { pair~(dotted) }
+ { \__chemformula_lewis_elspec_pair_dots: }
+\prop_put:Nnn \l__chemformula_lewis_elspec_types_prop { pair~(line) }
+ { \__chemformula_lewis_elspec_pair_line: }
+\prop_put:Nnn \l__chemformula_lewis_elspec_types_prop { single }
+ { \__chemformula_lewis_elspec_single: }
+\prop_put:Nnn \l__chemformula_lewis_elspec_types_prop { empty }
+ { \__chemformula_lewis_elspec_empty: }
+
+\cs_new_protected:Npn \__chemformula_lewis_elspec_pair_dots:
+ {
+ \chemformula_draw:nn { fill }
+ {
+ (node~cs \c_chemformula_colon_tl
+ name = chlewis-\int_use:N \g__chemformula_lewis_int ,
+ angle = \l__chemformula_elspec_angle_tl
+ )
+ ++
+ (
+ \l__chemformula_elspec_angle_tl
+ \c_chemformula_colon_tl
+ \l__chemformula_elspec_radius_tl
+ )
+ ++
+ (
+ \l__chemformula_elspec_angle_tl +90
+ \c_chemformula_colon_tl
+ .5\l__chemformula_elspec_pair_distance_dim
+ )
+ circle (\l__chemformula_radical_radius_dim)
+ ++
+ (
+ \l__chemformula_elspec_angle_tl -90
+ \c_chemformula_colon_tl
+ \l__chemformula_elspec_pair_distance_dim
+ )
+ circle (\l__chemformula_radical_radius_dim)
+ }
+ }
+
+\cs_new_protected:Npn \__chemformula_lewis_elspec_pair_line:
+ {
+ \chemformula_draw:nn
+ { line~width = \l__chemformula_elspec_pair_width_dim }
+ {
+ (node~cs \c_chemformula_colon_tl
+ name = chlewis-\int_use:N \g__chemformula_lewis_int ,
+ angle = \l__chemformula_elspec_angle_tl
+ )
+ ++
+ (
+ \l__chemformula_elspec_angle_tl
+ \c_chemformula_colon_tl
+ \l__chemformula_elspec_radius_tl
+ )
+ ++
+ (
+ \l__chemformula_elspec_angle_tl +90
+ \c_chemformula_colon_tl
+ .5\l__chemformula_elspec_pair_line_length_dim
+ )
+ --
+ ++
+ (
+ \l__chemformula_elspec_angle_tl -90
+ \c_chemformula_colon_tl
+ \l__chemformula_elspec_pair_line_length_dim
+ )
+ }
+ }
+
+\cs_new_protected:Npn \__chemformula_lewis_elspec_single:
+ {
+ \chemformula_draw:nn { fill }
+ {
+ (node~cs \c_chemformula_colon_tl
+ name = chlewis-\int_use:N \g__chemformula_lewis_int ,
+ angle = \l__chemformula_elspec_angle_tl
+ )
+ ++
+ (
+ \l__chemformula_elspec_angle_tl
+ \c_chemformula_colon_tl
+ \l__chemformula_elspec_radius_tl
+ )
+ circle (\l__chemformula_radical_radius_dim)
+ }
+ }
+
+\cs_new_protected:Npn \__chemformula_lewis_elspec_empty:
+ {
+ \chemformula_draw:nn { }
+ {
+ (node~cs \c_chemformula_colon_tl
+ name = chlewis-\int_use:N \g__chemformula_lewis_int ,
+ angle = \l__chemformula_elspec_angle_tl
+ )
+ ++
+ (
+ \l__chemformula_elspec_angle_tl
+ \c_chemformula_colon_tl
+ \l__chemformula_elspec_radius_tl
+ )
+ ++
+ (
+ \l__chemformula_elspec_angle_tl +90
+ \c_chemformula_colon_tl
+ .5\l__chemformula_elspec_pair_line_length_dim
+ )
+ coordinate (chlewis-tmp1)
+ ++
+ (
+ \l__chemformula_elspec_angle_tl -90
+ \c_chemformula_colon_tl
+ \l__chemformula_elspec_pair_line_length_dim
+ )
+ coordinate (chlewis-tmp2)
+ ++
+ (
+ \l__chemformula_elspec_angle_tl
+ \c_chemformula_colon_tl
+ .25\l__chemformula_elspec_pair_line_length_dim
+ )
+ coordinate (chlewis-tmp3)
+ ++
+ (
+ \l__chemformula_elspec_angle_tl +90
+ \c_chemformula_colon_tl
+ \l__chemformula_elspec_pair_line_length_dim
+ )
+ coordinate (chlewis-tmp4)
+ (chlewis-tmp1) -- (chlewis-tmp2) --
+ (chlewis-tmp3) -- (chlewis-tmp4) --
+ cycle
+ }
+ }
+
+\NewDocumentCommand\chlewis{O{}mm}
+ { \chemformula_lewis:nnn { #1 } { #2 } { #3 } }
+
+% --------------------------------------------------------------------------
\NewDocumentCommand \setchemformula { m }
{ \keys_set:nn { chemmacros / chemformula } { #1 } }
+\setchemformula{
+ bond-style = {} ,
+ arrow-style = {}
+}
+
% --------------------------------------------------------------------------
% hyperref support
\AfterPackage* { hyperref }
@@ -2319,6 +2572,7 @@
\cs_set:Npn \charrow #1 { #1 }
\cs_set:Npn \chname (#1)(#2) { #2~(#1) }
\cs_set:Npn \ch #1 { #1 }
+ \cs_set:Npn \chlewis #1#2 { #2 }
}
}
@@ -2431,13 +2685,16 @@ VERSION HISTORY
reference
- new option `tikz-external-disable'
- new option `frac-math-cmd'
+2013/10/24 - version 4.2 - \chemformula_font_inner: is only applied /once/ to
+ a formula, and at the beginning, fixes
+ https://bitbucket.org/cgnieder/chemmacros/issue/23
+ - fixed wrong setting of the TikZ bond style
+ - new option `arrow-style'
+ - new command \chlewis
% --------------------------------------------------------------------------
% TODO
-- add \tikzexternaldisable and an option to disable it to \ch, \chcpd,
- \charrow, and \bond
+- https://bitbucket.org/cgnieder/chemmacros/issue/23/
- Addukte: Zahlen nach * und . automatisch erkennen?
-- optionale Argumente von \\ nach außen weiterreichen?
-- zu `frac-style' die Möglichkeit einbauen, statt \frac, \dfrac oder \tfrac zu
- verwenden.
+- optionale Argumente von \\ nach außen