# Rhombus Tilings of a Hexagon with Three Fixed Border Tiles

## Theresia Eisenkölbl

### Abstract

We compute the number of rhombus tilings of a
hexagon with sides a,b,c,a,b,c with three fixed tiles
touching the border.
The particular case a=b=c solves a problem posed by Propp.
Our result
can also be viewed as the enumeration of plane partitions having
a rows and b columns, with largest entry smaller or equal to c, with
a given number of entries equal to c in the first row, a given number of
entries equal to 0 in the last column and a given bottom-left entry. (6 pages)

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Last modified: 20. April 2000
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