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Add action on matrices in row reduced echelon form#4311

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joschmitt merged 3 commits intooscar-system:masterfrom
ThomasBreuer:TB_action_on_subspaces
Nov 18, 2024
Merged

Add action on matrices in row reduced echelon form#4311
joschmitt merged 3 commits intooscar-system:masterfrom
ThomasBreuer:TB_action_on_subspaces

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@ThomasBreuer
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This implements the action of a matrix group on subspaces of its natural module.

This implements the action of a matrix group on subspaces
of its natural module.
Comment thread src/Groups/action.jl Outdated
```
"""
function on_rref_mats(m::MatElem{T}, x::MatrixGroupElem) where T <: FinFieldElem
return rref(m * x)[2]
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Suggested change
return rref(m * x)[2]
return echelon_form(m * x)

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It is the same, but since we have echelon_form, we might as well make use of it.

Call `echelon_form` instead of `rref`,
rename the function accordingly.
(Also `echelon_form` cannot be referenced via `@ref`.)
(`rref` and `echelon_form` have different output ...)
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This looks good. It seems to be a good starting point for what I need, thanks Thomas..

@joschmitt joschmitt merged commit bd57042 into oscar-system:master Nov 18, 2024
@ThomasBreuer ThomasBreuer deleted the TB_action_on_subspaces branch November 18, 2024 14:06
@lgoettgens lgoettgens added the release notes: use title For PRs: the title of this PR is suitable for direct use in the release notes label Feb 27, 2025
@lgoettgens lgoettgens changed the title add action on matrices in row reduced echelon form Add action on matrices in row reduced echelon form Feb 27, 2025
@mjrodgers mjrodgers mentioned this pull request Jul 2, 2025
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5 participants