Electronic approximations to most of the papers I've written since 1990 can be downloaded by clicking appropriate links below. In general, these files are in plain TeX format, and they represent the initial form of the paper before copy editing and other improvements made by the publishers.

To typeset many of these files you will need
Macros for illustrations
`picmac.tex` (2458 bytes).
Sometimes you also need to generate illustrations with the
MetaPost
source files provided. The published papers often include illustrations that
are not available in electronic form.

Of course users of these files should not violate the copyrights of the publishers.

These preprints are classified into four categories:

In each group the papers are listed in reverse chronological order. Identification numbers like P156 and Q133 refer to my list of publications, where complete bibliographic data can be found.

The following papers have been refereed:

- P160 Efficient coroutine generation of constrained Gray sequences, aka ``Deconstructing coroutines'' (written with Frank Ruskey).
- TeX file
`deco.tex`; MetaPost illustrations; another illustration; Compressed PostScript - P159 Dancing links.
- TeX file; MetaPost illustrations (B&W); MetaPost illustrations (color); Compressed PostScript (black-and-white version); Compressed PostScript (color version); Wassermann's beautiful solutions to the Aztec Diamond challenge
- P158 Linear probing and graphs.
- TeX file
`lpg.tex`(7558 bytes) - P157 Shellsort with three increments.
- TeX file
`swti.tex`(15822 bytes) - P156 Overlapping Pfaffians.
- TeX file
`op.tex`(14020 bytes) - P154 The Knowlton-Graham partition problem.
- TeX file
`kgpp.tex`(5134 bytes) - P153 Partitioned tensor products and their spectra.
- TeX file
`ptpats.tex`(7678 bytes); MetaPost file`ptpats.mp`(1465 bytes) - P152 On the inversion of y-to-the-alpha times e-to-the-y by means of associated Stirling numbers.
- TeX file
`cr.tex`(4792 bytes); TeX refs file`crrefs.tex`(824 bytes) - P151 Irredundant intervals.
- CWEB file
`interval.w`(17672 bytes); change file`interval-verbose.ch`(337 bytes) - P150 Aztec diamonds, checkerboard graphs, and spanning trees.
- TeX file
`aztec.tex`(7265 bytes) - P149 An exact analysis of stable allocation.
- TeX file
`easa.tex`(10384 bytes) - P148 The sandwich theorem.
- TeX file
`sand.tex`(38988 bytes); MetaPost file`sand.mp`(618 bytes) - P147 Leaper graphs.
- TeX file
`lg.tex`(23749 bytes) - P146 Polynomials involving the floor function.
- TeX file
`piff.tex`(7384 bytes) - P145 Two-way rounding.
- TeX file
`twr.tex`(13408 bytes) - P144 Mini-indexes for literate programs.
- TeX file
`milp.tex`(15415 bytes); CWEB file`ham.w`(2911 bytes); change file`ham.ch`(524 bytes); CTWILL file`system.bux`(288 bytes) - P143 Bracket notation for the coefficient-of operator.
- TeX file
`bnfc.tex`(10866 bytes) - P142 Johann Faulhaber and sums of powers.
- TeX file
`jfsp.tex`(18858 bytes) - P141 Convolution polynomials.
- TeX file
`cp.tex`(21312 bytes) - P140 The birth of the giant component.
- TeX file
`bgc.tex`(113574 bytes) - P139 Context-free multilanguages.
- TeX file
`cfm.tex`(13272 bytes) - P138 Theory and practice.
- TeX file
`tap.tex`(10741 bytes) - P137 Two notes on notation.
- TeX file
`tnn.tex`(25788 bytes) - P136 A note on digitized angles.
- TeX file
`nda.tex`(8439 bytes) - P135 Textbook examples of recursion.
- TeX file
`ter.tex`(15168 bytes) - P134 Nested satisfiability.
- TeX file
`ns.tex`(5653 bytes) - P132 The problem of compatible representatives.
- TeX file
`pcr.tex`(8326 bytes) - P127 Stable husbands.
- TeX file
`sh.tex`(15411 bytes) - P123 Efficient representation of perm groups.
- TeX file
`erpg.tex`(13113 bytes)

The following invited papers did not benefit from the formal refereeing mechanisms:

- Q241 Randomness in music
- Compressed PostScript file
`randomness.ps.gz`(254K bytes) - Q204 Three Catalan bijections
- Compressed PostScript file
`tcb.ps.gz`(70K bytes) - Q201 Robert W Floyd, In Memoriam
- Compressed PostScript file
`floyd.ps.gz`(741K bytes) - Q171 Teach Calculus with Big O (unabridged version)
- TeX file
`ocalc.tex`(7860 bytes) - Q145 Foreword to A=B by Petkovsek, Wilf, and Zeilberger.
- TeX file
`pwz.tex`(1487 bytes) - Q133 This Week's Citation Classic: Artistic programming.
- TeX file
`artprog.tex`(2390 bytes) - Q130 Icons for TeX and METAFONT.
- TeX file
`icons.tex`(7112 bytes) - Q115 Memories of Andrei Ershov.
- TeX file
`ershov.tex`(2317 bytes) - Q114 The genesis of attribute grammars.
- TeX file
`gag.tex`(17167 bytes)

The following documents are essentially notes to myself and a few colleagues; I don't intend to polish them for publication, although they might form the nucleus of later work. I suggest that you download them only if you haven't been able to find anything more exciting to read on the World Wide Web.

- Bipermutations (96.06.28)
- TeX file
`biperm.tex`(5785 bytes) - Squared differences of uniform deviates (95.07.18)
- TeX file
`sdud.tex`(1588 bytes) - An interesting bijection (95.05.17)
- TeX file
`ib.tex`(5047 bytes) - Solution to AMM problem 10430 (95.02.24)
- TeX file
`10430.tex`(2145 bytes) - Solution to AMM problem 10424 (95.02.24)
- TeX file
`10424.tex`(744 bytes) - Labeled bipartite trees (94.04.05)
- TeX file
`lbt.tex`(1543 bytes) - Nonattacking kings on a chessboard (94.02.23)
- TeX file
`nkc.tex`(2674 bytes) - Combinatorial matrices (93.01.07)
- TeX file
`cm.tex`(6621 bytes) - A bilinear identity (91.23.08)
- TeX file
`abi.tex`(1847 bytes) - An integer programming problem unsolved for 35 years (99.03.06)
- TeX file
`prob.tex`(4069 bytes); data file (4781 bytes) - A curious sequence of sets (08.01.17)
- Compressed PostScript file
`curious.ps.gz`(266328 bytes) - Diamonds and dragons: Notes on generalized dragon curves (10.09.24)
- Compressed PostScript file
`diamonds-and-dragons.ps.gz`(75351 bytes) - Comments on JRM problem 2680 (11.01.10)
- TeX file
`JRM2680.tex`(7731 bytes); PDF (82032 bytes) - Problems that Philippe would have loved (14.06.16)
- PDF (405217 bytes)
- Conjectures about set partitions and generating functions (18.01.06)
- text file (3K bytes)
- A conjecture about noncrossing partitions (19.02.06)
- PDF (83041 bytes)

- Q167 O Calculus: A letter about calculus reform
- TeX file
`ocalc.tex`(7853 bytes) - R47 Stanford's CS204 Problem Seminar 1985, edited by Ramsey Haddad
- PDF file (4.9MB)