 
 <prompt> Wetin be matrix groups for any constant c? Based on di question wey dey before, write small tori wey contain di answer. E fit be 1 - 20 sentences. Context: <response>: For any constant c. Matrix groups wey dey over dis fields dey fall under dis regime, as well as adele rings and adelic algebraic groups, wey dey important for number theory. Galois groups of infinite field extensions like the absolute Galois group fit also get topology, wey dem dey call Krull topology, wey dey central to generalize the connection of fields and groups to infinite field extensions wey we don talk about. An advanced generalization of dis idea, wey dem adapt to the needs of algebraic geometry, na the étale fundamental group. 