{VERSION 2 3 "DEC ALPHA UNIX" "2.3" }
{USTYLETAB {CSTYLE "Maple Input" -1 0 "Courier" 0 1 255 0 0 1 0 1 0 0 
1 0 0 0 0 }{CSTYLE "2D Math" -1 2 "Times" 0 1 0 0 0 0 0 0 2 0 0 0 0 0 
0 }{CSTYLE "2D Output" 2 20 "" 0 1 0 0 255 1 0 0 0 0 0 0 0 0 0 }
{PSTYLE "Normal" -1 0 1 {CSTYLE "" -1 -1 "" 0 1 0 0 0 0 0 0 0 0 0 0 0 
0 0 }0 0 0 -1 -1 -1 0 0 0 0 0 0 -1 0 }{PSTYLE "Maple Output" 0 11 1 
{CSTYLE "" -1 -1 "" 0 1 0 0 0 0 0 0 0 0 0 0 0 0 0 }3 3 0 -1 -1 -1 0 0 
0 0 0 0 -1 0 }{PSTYLE "" 11 12 1 {CSTYLE "" -1 -1 "" 0 1 0 0 0 0 0 0 
0 0 0 0 0 0 0 }1 0 0 -1 -1 -1 0 0 0 0 0 0 -1 0 }}
{SECT 0 {EXCHG {PARA 0 "> " 0 "" {MPLTEXT 1 0 23 "T:=array(1..3,[a,b,c
]);" }}{PARA 11 "" 1 "" {XPPMATH 20 "6#>%\"TG-%'VECTORG6#7%%\"aG%\"bG%
\"cG" }}}{EXCHG {PARA 0 "> " 0 "" {MPLTEXT 1 0 11 "indices(T);" }}
{PARA 11 "" 1 "" {XPPMATH 20 "6%7#\"\"\"7#\"\"#7#\"\"$" }}}{EXCHG 
{PARA 0 "> " 0 "" {MPLTEXT 1 0 234 "perm:=proc(t::array,n::posint)\n  \+
local i;\n  if [indices(t)]<>[[i]$i=1..n] then\n    ERROR(`expected it
s first argument to be an array indexed by 1..n, where n is the second
 argument, but received`,t,n)\n  else\n    recur(t,n,n)\n  fi\nend:" }
}}{EXCHG {PARA 0 "> " 0 "" {MPLTEXT 1 0 80 "exchange:=proc(t,i,j)\n  l
ocal c;\n  c:=t[i];\n  t[i]:=t[j];\n  t[j]:=c;\n  NULL\nend:" }}}
{EXCHG {PARA 0 "> " 0 "" {MPLTEXT 1 0 193 "recur:=proc(t,i,n)\n    loc
al j;\n    if i=1 then print([seq(t[j],j=1..n)])\n    else for j to i \+
do \n        exchange(t,i,j);\n        recur(t,i-1,n);\n        exchan
ge(t,i,j)\n      od\n    fi\n  end:" }}}{EXCHG {PARA 0 "> " 0 "" 
{MPLTEXT 1 0 28 "perm(array(1..3,[a,b,c]),3);" }}{PARA 11 "" 1 "" 
{XPPMATH 20 "6#7%%\"bG%\"cG%\"aG" }}{PARA 11 "" 1 "" {XPPMATH 20 "6#7%
%\"cG%\"bG%\"aG" }}{PARA 11 "" 1 "" {XPPMATH 20 "6#7%%\"cG%\"aG%\"bG" 
}}{PARA 11 "" 1 "" {XPPMATH 20 "6#7%%\"aG%\"cG%\"bG" }}{PARA 11 "" 1 "
" {XPPMATH 20 "6#7%%\"bG%\"aG%\"cG" }}{PARA 11 "" 1 "" {XPPMATH 20 "6#
7%%\"aG%\"bG%\"cG" }}}{EXCHG {PARA 0 "> " 0 "" {MPLTEXT 1 0 2 "\";" }}
{PARA 12 "" 1 "" {XPPMATH 20 "6#:6%%\"tG%\"iG%\"nG6#%\"jG6\"F*@%/9%\"
\"\"-%&printG6#7#-%$seqG6$&9$6#8$/F9;F.9&?(F9F.F.F-%%trueGC%-%)exchang
eG6%F7F-F9-%&recurG6%F7,&F-F.!\"\"F.F<F@F*F*" }}}{EXCHG {PARA 0 "> " 
0 "" {MPLTEXT 1 0 0 "" }}}}{MARK "7 0 0" 0 }{VIEWOPTS 1 1 0 1 1 1803 }