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diff --git a/Master/texmf-doc/doc/english/make-tex-work/examples/ex-04-01 b/Master/texmf-doc/doc/english/make-tex-work/examples/ex-04-01 new file mode 100644 index 00000000000..1b7d26d9380 --- /dev/null +++ b/Master/texmf-doc/doc/english/make-tex-work/examples/ex-04-01 @@ -0,0 +1,32 @@ +% Format: Plain +\font\chapfont=cmbx12 scaled 1728 +\font\titlefont=cmbx12 scaled 2073 +\font\secfont=cmbx12 scaled 1200 + +\parskip=\baselineskip +\parindent=0pt +\hsize=5in +\hoffset=.75in + +\leftline{\chapfont Chapter 1} +\vskip36pt + +\leftline{\titlefont Unsolved Problems} +\vskip36pt + +\leftline{\secfont 1.1\ \ Odd Perfect Numbers} +\vskip12pt + +A number is said to be {\it perfect\/} if it +is the sum of its divisors. For example, $6$ is +perfect because $1+2+3 = 6$, and $1$, $2$, and $3$ +are the only numbers that divide evenly into $6$ +(apart from $6$ itself). + +It has been shown that all even perfect numbers +have the form $$2^{p-1}(2^{p}-1)$$ where $p$ +and $2^{p}-1$ are both prime. + +The existence of {\it odd\/} perfect numbers is +an open question. +\bye |