Tasɣent (tusnakt)

Deg tusnakt, Tasɣent d tafekka tasnakant i d-isgensisen assaɣ imisin i teqqnen yal aferdis seg tagruma yettwassmman tagruma n tbadut neɣ tagrawt n tbadut neɣ taɣult $X\!$ s yiwen n uferdis deg tegrawt yettusemman tazdaɣult neɣ taɣult tamudemt. Neɣ s usemres n taftart tasnakant tamaddudt: $f\colon X\rightarrow Y,x\mapsto f(x)\!$

aɣawas amseffar ${\begin{aligned}&\scriptstyle f\colon [-1,1.5]\to [-1,1.5]\\&\textstyle x\mapsto {\frac {(4x^{3}-6x^{2}+1){\sqrt {x+1}}}{3-x}}\end{aligned}}$

Tagensest tudmawant i tesɣent

Azamul n tesɣent

Seg usenmel-a, ttwafarasen-tt-d waṭas n tɣawsiwin tigejdanin:

• I yal amsedfar tagrawt tabadut tettwasemma $X\!$.
• I yal amsedfar n tegrawt n tezdaɣult tettwasemma $Y\!$.
• Ulamek ɣef uferdis seg tegrawt n tagruma $X\!$ ad tettwaqqen anagar s uferdis amyiwen seg tegrawt n tezdaɣult $Y\!$.
• Aferdis seg tegrawt n tezdaɣult $Y\!$ yezmer ad yettwiqqen s yiwen n uferdis neɣ ugar seg tegrawt n tegruma $X\!$.

Ma tella tegruma d tagrawt n wazalen i yezmer umeskil imziregad yawi $x$, ihi tazdaɣult d tagrawt n wazalen unẓiren i wazalen n tesɣent $f(x)\!$.