Atractor offers a large variety of resources related to the dissemination of Mathematics.

Some of Atractor's resources

Conditions regarding the use of Atractor's resources

The CDFs made available on this site are distributed under the Creative Commons Attribution-ShareAlike 4.0 International License (CC BY-SA) license, which implies that CDFs may be used and distributed with changes, whether by remixing, transforming or expanding, as long as the new creations are licensed under the same terms.

All other resources made available on this site, including software, are distributed under the terms of a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License, and may be freely used provided that: 1) the use is for non-profit, (2) their origin is explicitly mentioned; and (3) they are used and distributed without changes, so that material resulting from remixing, transforming, or expanding cannot be distributed. We hope you find them interesting and useful.

If you wish to support Atractor's activities you can do so through a donation.
Your donation must be made by bank transfer to the account:

IBAN: PT50003505780002321213096

BIC SWIFT CGDIPTPL

Conditions on the commercial use of materials

The use for commercial purposes, not allowed by the above conditions, requires permission by Atractor which can be requested through the contact: atractor AT atractor DOT pt. The situation will be studied on a case-by-case basis by Atractor's board.