Ameccaq

Imeccaqen isnakanen
Tisɣanin
Arɣis	Tasɣent n umeccaq tuzmilt
Ameccaq n Chebyshev	Ameccaq aklidan
Ameccaq n Hausdorff	Ameccaq n uṭaksi
Ameccaq
Imeccaqen ger n tfekkiwin tisnakanin
gar n wagaz d umaɣud	Gar n sin n wagazen
Gar n wagaz d ugni	Gar n sin n izerrigen imsadaɣen
Gar n sin n izelman imezluga

Ameccaq neɣ Astum gar n sin n wagazen d teɣzi n uzerrig amaɣad gar n sin n wagazen-a. Tikwal tettili-d tenfalit ɣef umeccaq s yirem n wakud issefken i wakken ad tiddel s tikli neɣ s temseddut (aɣanib-a yeṭṭafar isemrasen iyalassen. maca mači ussniwen, acku ur yelli ara d ufrin). Dɣa tafat tettwasled deg wanecta acku tazzla-ines d timbeddit (s unect n tiẓri tamassaɣt) ɣef wanecta i ttwasidnen imeccaqen isnallunen s ifawatayen (ameccaq i tetteddu tafat deg useggas) s talɣa tussnant.

Ameccaq yettwasnes deg ufaris (Tallunt × Tallunt) ar wuṭṭunen imdettiyen ilawen, ayen yennumken asnas yeqqnen yal sin n wagazen deg tallunt s wuṭṭun imdetti ilaw. Asnas-a ittfaras-d timentilin-a:

• $\forall (x,y)\in E^{2}:d(x,y)=d(y,x)$ (arawas)
• $\forall (x,y)\in E^{2}:d(x,y)=0\Leftrightarrow x=y$ (abeṭṭay)
• $\forall (x,y,z)\in E^{3}:d(x,z)\leq d(x,y)+d(y,z)$ (Tanmeglit takeṛdisant)