File:QfacMapT500a.jpg

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[[Complex map of function square root of factorial, or $\sqrt{!}$, or halfiteration of factorial

$h=\mathrm{Factorial}^{1/2}$

is such function that $ h(h(z)) = z!$ in wide range of values of $z$.

Levels $u=\Re(h(z))=\rm const$ and Levels $u=\Im(h(z))=\rm const$ are shown in the plane $z=x+\mathrm i y$.

C++ generator of curves

// In order to compile the code below, the following files should be loaded in the working directory: // fac.cin , // facp.cin , // afacc.cin , // superfac.cin , // arcsuperfac.cin , // ado.cin , // conto.cin

//

 #include <math.h>
 #include <stdio.h>
 #include <stdlib.h>
 using namespace std;
 #include <complex>
 #define DB double
 #define DO(x,y) for(x=0;x<y;x++)
 typedef complex<double> z_type;
 #define Re(x) x.real()
 #define Im(x) x.imag()
 #define I z_type(0.,1.)
 #include "fac.cin"
 #include "facp.cin"
 #include "afacc.cin"
 #include "superfac.cin"
 #include "arcsuperfac.cin"
 //#include "superex.cin"
 //#include "superlo.cin"
 DB xL=0.31813150520476413;
 DB yL=1.3372357014306895;

 #include "conto.cin"

 int main(){ int j,k,m,n,n1; DB x,y, p,q, t; z_type z,c,d;
 int M=400,M1=M+1;
 int N=401,N1=N+1;
 DB X[M1],Y[N1], g[M1*N1],f[M1*N1], w[M1*N1]; // w is working array.
 char v[M1*N1]; // v is working array
 FILE *o;o=fopen("qfacMap.eps","w");ado(o,402,402);
 fprintf(o,"201 201 translate\n 20 20 scale\n");
 DO(m,M1) X[m]=-8.+.04*m;
 DO(n,N1){ y=-8.+.04*n; if(y<-.011) Y[n]=y; else break;}
        Y[n]= -.01; n++;
        Y[n]= +.01; n++;
 for(j=n;j<N1;j++){y=-8.+.04*(j-1); Y[j]=y;}
 for(m=-8;m<9;m++){if(m==0){M(m,-8.5)L(m,8.5)} else{M(m,-8)L(m,8)}}
 for(n=-8;n<9;n++){ M( -8,n)L(8,n)}
 fprintf(o,".008 W 0 0 0 RGB S\n");
 DO(m,M1)DO(n,N1){g[m*N1+n]=9999; f[m*N1+n]=9999;}
 DO(m,M1){x=X[m]; printf("%5.2f\n",x);
 DO(n,N1){y=Y[n]; z=z_type(x,y);
 // c=afacc(z);
 // c=fac(c);
        c=arcsuperfac(z);
        c=superfac(.5+c);
 // c=FSLOG(z);
 // c=FSEXP(.5+c);
 // d=z;
 // p=abs(c-d)/(abs(c)+abs(d)); p=-log(p)/log(10.)-1.;
        p=Re(c);q=Im(c);
        if(p>-999 && p<999) g[m*N1+n]=p;
        if(q>-999 && q<999 && fabs(q)> 1.e-14) f[m*N1+n]=q;
                        }}
 fprintf(o,"1 setlinejoin 1 setlinecap\n"); //p=6.;q=6.;
 //#include"plofu.cin"
 p=1;q=.5;
 for(m=-2;m<2;m++) for(n=1;n<10;n+=1)conto(o,f,w,v,X,Y,M-20,N,(m+.1*n),-q, q); fprintf(o,".02 W 0 .6 0 RGB S\n");
 for(m= 0;m<2;m++) for(n=1;n<10;n+=1)conto(o,g,w,v,X,Y,M-20,N,-(m+.1*n),-q, q); fprintf(o,".02 W .9 0 0 RGB S\n");
 for(m= 0;m<2;m++) for(n=1;n<10;n+=1)conto(o,g,w,v,X,Y,M-20,N, (m+.1*n),-q, q); fprintf(o,".02 W 0 0 .9 RGB S\n");
 for(m=1;m<5;m++) conto(o,f,w,v,X,Y,M,N, (0.-m),-p,p); fprintf(o,".04 W .9 0 0 RGB S\n");
 for(m=1;m<5;m++) conto(o,f,w,v,X,Y,M,N, (0.+m),-p,p); fprintf(o,".04 W 0 0 .9 RGB S\n");
                  conto(o,f,w,v,X,Y,M,N, (0. ),-p,p); fprintf(o,".04 W .6 0 .6 RGB S\n");
 for(m=-4;m<5;m++) conto(o,g,w,v,X,Y,M,N, (0.+m),-p,p); fprintf(o,".04 W 0 0 0 RGB S\n");
 fprintf(o,"0 setlinejoin 0 setlinecap\n");
 x=.85;
 M(x,0)L(-8.1,0) fprintf(o,".07 W 1 1 1 RGB S\n");
 DO(m,22){ M(x-.4*m,0) L(x-.4*(m+.5),0) } fprintf(o,".1 W 0 0 0 RGB S\n");
 fprintf(o,"showpage\n%c%cTrailer",'%','%'); fclose(o);
        system("epstopdf qfacMap.eps");
        system( "open qfacMap.pdf"); // for mac
 // getchar(); system("killall Preview"); //for macintosh
 //return 0;
 }

Latex generator of labels

%

\documentclass[12pt]{article}
\usepackage{graphicx}
\usepackage{geometry}
\paperwidth 340pt
\paperheight 340pt
\usepackage{rotating}
\textwidth 800mm
\textheight 400mm
\topmargin -61mm
\oddsidemargin -77pt
\parindent 0pt
\newcommand \sx {\scalebox}
%
\newcommand \rot \begin{rotate}
%
%
\newcommand \ero \end{rotate}
%
\newcommand \ax {
\put( 10,346){\sx{1.4}{$y$}}
\put( 10,307){\sx{1.3}{$6$}}
\put( 10,267){\sx{1.3}{$4$}}
\put( 10,227){\sx{1.3}{$2$}}
\put( 10,187){\sx{1.3}{$0$}}
\put( 0,147){\sx{1.3}{$-2$}}
\put( 0,107){\sx{1.3}{$-4$}}
\put( 0, 67){\sx{1.3}{$-6$}}
\put( 0, 27){\sx{1.3}{$-8$}}
\put( 50, 17){\sx{1.3}{$-6$}}
\put( 90, 17){\sx{1.3}{$-4$}}
\put(130, 17){\sx{1.3}{$-2$}}
\put(178, 17){\sx{1.3}{$0$}}
\put(218, 17){\sx{1.3}{$2$}}
\put(258, 17){\sx{1.3}{$4$}}
\put(298, 17){\sx{1.3}{$6$}}
\put(334, 17){\sx{1.4}{$x$}}
}
\begin {document}
\begin{picture}(350,420)'"`UNIQ--item-3--QINU`"' %\put(-20,-10){\includegraphics{fig4a}}\ax'"`UNIQ--item-3--QINU`"' \put(-20,-10){\includegraphics{qfacMap}}\ax'"`UNIQ--item-3--QINU`"' \put(20,174){\sx{1.1}{$u$=0}}'"`UNIQ--item-3--QINU`"' \put(66,160){\sx{1.1}{$v$=0}}'"`UNIQ--item-3--QINU`"' \put(101,174){\sx{1.1}{$u$=0}}'"`UNIQ--item-3--QINU`"' \put(132,174){\sx{1.1}{$v$=0}}'"`UNIQ--item-3--QINU`"' {\put(70,187){\sx{1.8}{\bf cut}}}'"`UNIQ--item-3--QINU`"' \put(300,277){\rot{ 10}\sx{1.3}{$u\!=\!-4$}\ero}'"`UNIQ--item-3--QINU`"' \put(310,250){\rot{16}\sx{1.3}{$u\!= 4$}\ero}'"`UNIQ--item-3--QINU`"' \put(300,205){\rot{-7}\sx{1.3}{$v\!= 4$}\ero}'"`UNIQ--item-3--QINU`"' \put(300,172){\rot{ 6}\sx{1.3}{$v\!=\!-4$}\ero}'"`UNIQ--item-3--QINU`"' \put(308,128){\rot{-23}\sx{1.3}{$u\!= 4$}\ero}'"`UNIQ--item-3--QINU`"' \put(300, 99){\rot{-15}\sx{1.3}{$u\!=\!-4$}\ero}'"`UNIQ--item-3--QINU`"' \end{picture}
\end{document}
%

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current15:36, 11 July 2013Thumbnail for version as of 15:36, 11 July 20132,352 × 2,352 (1.99 MB)T (talk | contribs)[[Complex map of function square root of factorial, or $\sqrt{!}$, or halfiteration of factorial $h=\mathrm{Factorial}^{1/2}$ is such function that $ h(h(z)) = z!$ in wide range of values of $z$. Levels $u=\Re(h(z))=\rm const$ and Leve...

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