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Make RestrictedMapping of a group homomorphism use the same Range as the original morphism#6230

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stertooy wants to merge 1 commit intogap-system:masterfrom
stertooy:restricted-mapping-range
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Make RestrictedMapping of a group homomorphism use the same Range as the original morphism#6230
stertooy wants to merge 1 commit intogap-system:masterfrom
stertooy:restricted-mapping-range

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Closes #6225

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see title

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Shouldn't have much impact, unless some other code actually relied on RestrictedMapping returning a surjective map.

@ThomasBreuer ThomasBreuer added the release notes: use title For PRs: the title of this PR is suitable for direct use in the release notes label Feb 12, 2026
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The proposed changes are correct.

In another pull request, we will eventually

  • extend the documentation of RestrictedMapping in order to state what the return value is,
  • make sure that all methods of RestrictedMapping fit to this description,
  • document the surjective option that is used already in at least one of these methods.

@ThomasBreuer ThomasBreuer changed the title Make RestrictedMapping of a group homomorphism use the same range as the original morphism Make RestrictedMapping of a group homomorphism use the same Range as the original morphism Feb 12, 2026
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RestrictedMapping incorrectly changes the codomain (Range) of the resulting morphism

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