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% file `diffcoeff.def'
% variant forms of derivative
% 2018-11-12
% Andrew Parsloe ajparsloe@gmail.com
%
% paren, up, Up, wrapall, nabla, left, svrule
% pvrule, padrift, psqbra, pDelta, pleft, ptxt, pscr
%%%%%%%%%% ordinary %%%%%%%%%%
% ( ) for pt of eval.
\diffdef { paren } 
  {
    left-delim   = \left ( ,
    right-delim  = \right ),
    subscr-nudge = -6 mu
  }

% upright
\diffdef { up } 
  {
    op-symbol      = \mathrm{d},
    op-order-sep   = 0 mu      ,
    /-op-order-sep = 0 mu
  }

\diffdef { Up } 
  {
    op-symbol      = \mathrm{D},
    op-order-sep   = 0 mu      ,
    /-op-order-sep = 0 mu
  }

% wrap long vars: (d longvar)
\diffdef { wrapall } {long-var-wrap = (dv)}

% nabla in numerator, d in denominator
\diffdef { nabla } 
  {
    op-symbol     = \nabla,
    op-symbol-alt = d
  }

% align op left; no italic nudge 
\diffdef { left } 
  {
    *-op-left      = true,
    *-italic-nudge = 0 mu
  }

% slash-form: vrule for pt of eval
\diffdef { svrule } 
  {
    /-left-delim  =  ,
    /-right-delim = |
  }

%%%%%%%%%% partial %%%%%%%%%%
% partial, vrule for pt of eval.
\diffdef { pvrule } { op-symbol = \partial }

% partial, no subscr nudge (adrift in a sea of white space)
\diffdef { padrift } 
  { 
    op-symbol    = \partial,
    left-delim   = \left ( ,
    right-delim  = \right ),
    subscr-nudge = 0 mu
  }

% partial, [ ] for pt of eval.
\diffdef { psqbra } 
  {
    op-symbol    = \partial,
    left-delim   = \left [ ,
    right-delim  = \right ],
    subscr-nudge = 0 mu
  }

% Delta as partial deriv.
\diffdef { pDelta } 
  {
    op-symbol      = \Delta  ,
    op-order-sep   = 0 mu    ,
    /-op-order-sep = 0 mu    ,
    left-delim     = \left ( ,
    right-delim    = \right ),
    subscr-nudge   = -6 mu
  }

% align op left; italic nudge
\diffdef { pleft } 
  {
    op-symbol      = \partial,
    *-op-left      = true    ,
    *-italic-nudge = 3 mu    ,
    left-delim     = \left ( ,
    right-delim    = \right ),
    subscr-nudge   = -3 mu
  }

% partial, textstyle
\diffdef { ptxt } 
  {
    op-symbol      = \partial,
    denom-term-sep = 1 mu    ,
    left-delim     = \left ( ,
    right-delim    = \right ),
    elbowroom      = -2 mu   ,
    subscr-nudge   = -3 mu 
  }

% partial, wide sep of terms
\diffdef { pwide } 
  {
    op-symbol        = \partial,
    denom-term-sep   = 3 mu    ,
    /-denom-term-sep = 3 mu    ,
    left-delim       = \left ( ,
    right-delim      = \right ),
    subscr-nudge     = -6 mu 
  }