Deprecated: $wgMWOAuthSharedUserIDs=false is deprecated, set $wgMWOAuthSharedUserIDs=true, $wgMWOAuthSharedUserSource='local' instead [Called from MediaWiki\HookContainer\HookContainer::run in /var/www/html/w/includes/HookContainer/HookContainer.php at line 135] in /var/www/html/w/includes/Debug/MWDebug.php on line 372
A simple matrix semigroup which is not completely simple - MaRDI portal

Deprecated: Use of MediaWiki\Skin\SkinTemplate::injectLegacyMenusIntoPersonalTools was deprecated in Please make sure Skin option menus contains `user-menu` (and possibly `notifications`, `user-interface-preferences`, `user-page`) 1.46. [Called from MediaWiki\Skin\SkinTemplate::getPortletsTemplateData in /var/www/html/w/includes/Skin/SkinTemplate.php at line 691] in /var/www/html/w/includes/Debug/MWDebug.php on line 372

Deprecated: Use of QuickTemplate::(get/html/text/haveData) with parameter `personal_urls` was deprecated in MediaWiki Use content_navigation instead. [Called from MediaWiki\Skin\QuickTemplate::get in /var/www/html/w/includes/Skin/QuickTemplate.php at line 131] in /var/www/html/w/includes/Debug/MWDebug.php on line 372

A simple matrix semigroup which is not completely simple (Q1100291)

From MaRDI portal





scientific article; zbMATH DE number 4042172
Language Label Description Also known as
English
A simple matrix semigroup which is not completely simple
scientific article; zbMATH DE number 4042172

    Statements

    A simple matrix semigroup which is not completely simple (English)
    0 references
    1988
    0 references
    An example of a simple irreducible subsemigroup of the full linear group \(GL_ 2({\mathbb{Q}})\), which is not a group, is constructed. This solves Problem 9.1 from the survey paper of \textit{I. S. Ponizovskij} [Semigroup Forum 24, 117-148 (1982; Zbl 0491.20053)].
    0 references
    simple irreducible subsemigroup
    0 references
    0 references

    Identifiers