Welcome to Eduardo Viruena Silva's Home Page

Eduardo Virueña Silva


This is a toy, hope you like it... Spirograph (PDF)
or... if you prefer the PDF version Spirograph (GIF)
or... if you like play with a Spirograph inside a Spirograph spirograph
and, if you want even more... then try the SuperSpirograph .

Graphics of functions f : [ax, bx] × [ay, by] → R

Creates graphics of functions R2 → R.

Turtle Graphics

Click here to make PDF turtle graphics

Click here to make EPS turtle graphics


L-Systems and 2-Dimensional turtles, recursive curves.

L-Systems and 3-Dimensional turtles, recursive polyhedra, fractalhedra.

Symbolic Manipulation

Arden's Rule


Create your Maze or Labyrinth

Beakman's electric motor

Click here to watch the video

Sliced Solids

Having a slicer in home is not a good idea, specially if you are a mathematician. Take a look.


Foamy solids

Lond division

Long division is a program for verifying your elementary school homework, please don't use it for cheating.

Trigonometry (without drawing)

Memories of my courses on Calculus and Trigonometry in ESFM.

This page have been visited a lot of times times since June 30th, 1997.