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Add another ViewString method for inverse semigroups #438

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Jan 13, 2016
Merged

Add another ViewString method for inverse semigroups #438

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7 changes: 6 additions & 1 deletion lib/semigrp.gi
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Original file line number Diff line number Diff line change
Expand Up @@ -113,7 +113,12 @@ InstallMethod(ViewString, "for a semigroup with generators",
InstallMethod(ViewString, "for a monoid with generators",
[IsMonoid and HasGeneratorsOfMonoid], _ViewStringForSemigroups);

InstallMethod(ViewString, "for an inverse semigroup with generators",
InstallMethod(ViewString, "for an inverse semigroup with semigroup generators",
[IsInverseSemigroup and HasGeneratorsOfSemigroup],
_ViewStringForSemigroups);

InstallMethod(ViewString,
"for an inverse semigroup with inverse semigroup generators",
[IsInverseSemigroup and HasGeneratorsOfInverseSemigroup],
_ViewStringForSemigroups);

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13 changes: 13 additions & 0 deletions tst/testinstall/semigrp.tst
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Expand Up @@ -431,6 +431,19 @@ false
gap> IsEmpty(T);
true

# Check for correct ViewString method for IsInverseSemigroup and
# HasGeneratorsOfSemigroup
gap> S := Semigroup(Transformation([4, 3, 5, 5, 5]),
> Transformation([4, 1, 5, 2, 5]),
> Transformation([5, 5, 2, 1, 5]));
<transformation semigroup of degree 5 with 3 generators>
gap> IsInverseSemigroup(S);
true
gap> Size(S);
36
gap> S;
<inverse transformation semigroup of size 36, degree 5 with 3 generators>

#
gap> STOP_TEST( "semigrp.tst", 1060000);

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