Patch is here:
diff --git a/src/algebra/array2.spad b/src/algebra/array2.spad
index 8604a9c..3d751da 100644
--- a/src/algebra/array2.spad
+++ b/src/algebra/array2.spad
@@ -1015,9 +1015,10 @@ TwoDimensionalArrayCategory(R, Row, Col) : Category
== Definition where
coerce(m : %) ==
l : List List OutputForm
- l := [[qelt(m, i, j) :: OutputForm _
- for j in minColIndex(m)..maxColIndex(m)] _
- for i in minRowIndex(m)..maxRowIndex(m)]
+ minC := minColIndex m; maxC := maxColIndex m
+ minR := minRowIndex m; maxR := maxRowIndex m
+ minC > maxC or minR > maxR => return []::OutputForm
+ l := [[qelt(m, i, j) :: OutputForm for j in minC..maxC] for i in
minR..maxR]
matrix l
)abbrev domain IIARRAY2 InnerIndexedTwoDimensionalArray
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