--- title: "cpxa - Cours 2 : " tags: cpxa, cours, MiMos --- {%hackmd theme-dark %} $$ \newcommand{\vt}[3]{ \begin{pmatrix} {#1} \\ {#2} \\ {#3} \end{pmatrix} } \newcommand{\limto}[1]{\xrightarrow[#1]{}} $$ # CPXA - Cours 2 : $\circ$ $\Theta$ et $\Omega$ [`video`](url_video) [`cours`](url_cours) [`slides`](url_slides) ## Introduction - $f(n) = \bigcirc(g(n))$ f est au oire proportionnelle à $g(n)$ donc f inf ou egal à g - $f(n) = \theta (g(n))$ $f(n)$ est proportionnelle à / est du même ordre que $g(n)$ donc $f = g$ - $f(n) = \Omega(g(n))$ ... $\bigcirc(g(n)) = $ $$ \{f(n) \exists c > 0, \exists n_0, \forall n >eggal n_0 ou 0 <egal f(n) <egal cg(n)\} $$ $\Omega(g(n))$ $$ f(n) \exists c > 0, ù_exists n_0, \forall n <eg n_0 ou 0<eg cg(n) <eeg f(n) $$
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