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$$\dot{x}=\sigma(y-x),\quad \dot{y}=x(\rho-z)-y,\quad \dot{z}=xy-\beta z$$

$$\text{IFS:}\ \begin{cases} f_1(x,y)=(0,0.16y) \\ f_2(x,y)=(0.85x+0.04y, -0.04x+0.85y+1.6) \\ f_3(x,y)=(0.2x-0.26y, 0.23x+0.22y+1.6) \\ f_4(x,y)=(-0.15x+0.28y, 0.26x+0.24y+0.44) \end{cases}$$

$$x_{n+1}=\sin(a y_n)+c\cos(a x_n),\ y_{n+1}=\sin(b x_n)+d\cos(b y_n)$$

$$x_{n+1}=\sin(a y_n)-\cos(b x_n),\ y_{n+1}=\sin(c x_n)-\cos(d y_n)$$

$$x_{n+1}=1-a x_n^2 + y_n,\quad y_{n+1}=b x_n$$

$$t=\kappa-\frac{0.4}{1+x_n^2+y_n^2};\ x_{n+1}=1+u(x_n\cos t - y_n\sin t);\ y_{n+1}=u(x_n\sin t + y_n\cos t)$$

$$x=A\sin(a t+\delta),\ y=B\sin(b t)$$

$$\dot{x}=-(y+z),\ \dot{y}=x+a y,\ \dot{z}=b+z(x-c)$$

$$\dot{x}=(z-b)x-dy,\ \dot{y}=dx+(z-b)y,\ \dot{z}=c+az-\frac{z^3}{3}$$

$$\dot{x}=y-ax+byz,\ \dot{y}=cy-xz+z,\ \dot{z}=dxy-ez$$

$$\dot{x}=a(y-x),\ \dot{y}=(c-a)x-xz+cy,\ \dot{z}=xy-bz$$

$$\dot{x}=ax+yz,\ \dot{y}=bx+cy-xz,\ \dot{z}=-z-xy$$

$$x=(R-r)\cos t + d\cos\!\left(\tfrac{R-r}{r}t\right),\ y=(R-r)\sin t - d\sin\!\left(\tfrac{R-r}{r}t\right)$$