Talk:2.3.7 subgroup: Difference between revisions
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:: That's a lot of abstraction for what is essentially very simple: extension = make bigger, restriction = make smaller. – [[User:Sintel|Sintel🎏]] ([[User_talk:Sintel|talk]]) 20:33, 23 April 2025 (UTC) | :: That's a lot of abstraction for what is essentially very simple: extension = make bigger, restriction = make smaller. – [[User:Sintel|Sintel🎏]] ([[User_talk:Sintel|talk]]) 20:33, 23 April 2025 (UTC) | ||
:: I asked Claude 3.7 and was convinced that group extension can be used for weak 'extension'. (It's not that I understood cohomology or anything like that.) To return to the topic, I agree to put aside retract, which is similar to both saturation and projection. --[[User:Dummy index|Dummy index]] ([[User talk:Dummy index|talk]]) 15:00, 24 April 2025 (UTC) | |||
Revision as of 15:00, 24 April 2025
retraction/expansion terminology
I know this is well-defined on temperaments, but for subgroups, I would prefer the more well-known terms restriction/extension.
– Sintel🎏 (talk) 23:18, 22 April 2025 (UTC)
- It seems necessary to consider the relationship with Group extension. (Can group extension be used in relation to 2.3.5 and 2.9.5?) ... Oh dear, there's also Retract (group theory).
- Retraction seems like it could be directly used in the definition of saturation. --Dummy index (talk) 12:01, 23 April 2025 (UTC)
- I asked Claude 3.7 and was convinced that group extension can be used for weak 'extension'. (It's not that I understood cohomology or anything like that.) To return to the topic, I agree to put aside retract, which is similar to both saturation and projection. --Dummy index (talk) 15:00, 24 April 2025 (UTC)