Thiin Kakan

ayaa ka dhaxeysa baraha xarriiq tiro iyo tirooyinka maangalka ah, taasoo inoo fududeyneysa shaqaynta Aljabraha. Tusaale ahaan ma jirto tiro maangal ah oo raalligelineysa isle'egta : ${\displaystyle x^{2}+1=0}$. Isle'egta iyo wixii la mid ah si aynu u furfurno waxaynnu adeegsaneynaa ururka tirooyinka kakan.

Tirooyinka habdhiskaa ku jiraa waxey ka koobanyihiin, lammaanayaal hoorsan oo maangal ah (a, b). Sidaa daraadeed, way inoo suuragelaysaa inaynu iskubeegnaan 1------1 ka dhaxeysiino tirooyinka kakan iyo dhibcaha sallax ka koobanyahay. Guud ahaan Zi waxey u taagantahay lamaanayaal hoorsan oo tirooyinka maangalka ah K-na waxey u taagantahay ururka tirooyinkaa oo dhan.

Haddii :${\displaystyle z_{1}\in k,z_{2}\in k,}$ oo ${\displaystyle z_{2}\neq (0,0);}$ markaa :${\displaystyle {\cdot }{\frac {z_{1}}{z_{2}}}={z_{1}}{z-1_{2}}}$ 

go'aanka halkaas inooga soo baxaya waa in:

${\displaystyle \,\left({c,o \over c,o}\right)=(a,0){(c,0)^{1}}}$

= ( a , 0 ) :${\displaystyle =\{{\cdot }{\frac {1}{c}},0\}.}$

= [${\displaystyle {\cdot }{\frac {a}{c}}-0,a.0+0.{\frac {1}{c}}}$]