The following usage policies apply to the site. They do not apply to websites or software operated by organizations, groups or individuals that are in any way associated with They do not apply to any other Internet website, including those that have hypertext links with

The terms "you" and "user" are used to refer to any information consumer – including Internet robots – who accesses the site. The term "this page" is used to refer to the page

You acknowledge that these policies are part of the site and by accessing or using this site, you agree to be bound by all the terms and conditions of these policies. If you do not agree to these terms, do not access or use the site.

It is our attempt to provide accurate information; however, does not guarantee the accuracy of the information or advice contained on this page. This site reserves the right to change these policies in any way at any time by updating this page without prior notice.

Acceptable use of the site

The user agrees not to use the name "juanrga", "symplectics" or their logos for any promotional or commercial purpose or any other purpose without first obtaining the written consent of the copyright owner of the site.

Prohibited use of the site

The user agrees not to modify, alter or create derivative works from the material contained on the site without first obtaining the written consent of the copyright owner of this site.

The user agrees not to engage in any illegal or unauthorized commercial activity on this site.

User may not post copyrighted material without first obtaining written consent from the copyright owner.

The user agrees not to do anything that interferes with the proper functioning of this site. This includes activities that may overload the website's infrastructure, alter the software that makes up the site, and delete or change information posted by any other author.

Waiver of warranties

The site take measures to protect, but there is no warranty that the site will operate error-free or will be free of infection by viruses or any other contaminating or destructive properties.

The site is not responsible for any damage or cost due to lost of data, servicing, or replacing equipment or data. In no event will this site be liable for any damages whatsoever (including, without limitation, incidental and consequential damages, lost profits or damages resulting from lost data or business interruption) resulting from the use and inability to use this site and the material, whether based in warranty, contract, tort, or any other legal theory, and whether or not this site is advised of the possibility of such damages.

Links to other sites

The site may contain links to third-party sites which are not controlled by this site. These links are provided solely as a convenience to users and not as an endorsement for any company, organization, group or individual.

The site is not responsible for the accuracy, copyright compliance, legality or decency of material contained on any other website, including those that have hypertext links to this site. The site encourages you to be aware when you leave this site and to exercise discretion while browsing the Internet.


User identities remain anonymous when using the site unless the user provides this information as a part of a registration in order to utilize any of the personalization services.

Some personal information –including name, addresses, phone numbers, email addresses, and other demographic information– is collected for partnership, meeting registrations, and other similar transactions or to conduct e-commerce (for instance, making purchases from the online store). The site may make use of this information to inform you about situations or services that may interest you, including specific promotions.

As you explore through the site, the site servers log information about your session –such as IP address, what browser you are using, the time and date you visited, and what pages you visited–. This information may be used to help diagnose problems with servers and to administer or improve services on this site.

No data transmission over the Internet or any wireless network can be guaranteed to be 100% secure. As a result, while the site strives to protect your personally identifiable information, you acknowledge that: (i) there are security and privacy limitations of the Internet which are beyond the control of this site; (ii) the security, integrity and privacy of any and all information and data exchanged through this site cannot be guaranteed; and (iii) any such information and data may be viewed or tampered with in transit by a third party.

The site take measures to protect, but there is no warranty that the site will be free of infection by viruses or any other contaminating or destructive properties. This site is not responsible for any damage or cost due to lost of data, servicing, or replacing equipment or data. The user accepts sole responsibility and risk associated with the use and results of this site's materials, irrespective of the purpose to which such use or results are applied.

Any feedback that is submitted becomes the property of this site and we may use this feedback for marketing purposes, or to contact you for more information.

Returns and refunds

Pdf files cannot be returned. Hardcover books and merchandising can be returned within 15 days of receipt of shipment for a full refund.

Products must be returned using a trackable shipping method and the customer will pay for the return to the carrier. The returned product must be unused and in the same condition that you received it. Any returned product that is damaged due to customer misuse, is missing parts, or is in unsellable condition due to customer tampering will not be refunded or replaced.

If the item sold was damaged or defective prior to the receipt of shipment, the customer will receive a free replacement.

If 15 days have passed since your receipt of shipment, you will not be offered a refund or replacement of any kind.


A misconception among many people is that if material appears on the Internet, then it is free for the taking. However, just because you receive information or find it posted on the Internet, this does not mean that you are free to reproduce it and forward it (distribute, transmit, etc.) to others without appropriate permission or without a license agreement if your usage is beyond fair use. Copyright notices are not required by law, so if you do not see a copyright notice on any item, do not assume that it is free to use or pass along to others.

Copyright protects original works of authorship; including literary works; scientific databases; dramatic works, pantomimes and choreographic works; pictorial, graphic, and sculptural works; motion pictures and other audiovisual works; sound recordings and musical works; architectural works; computer codes and software; and other works. Works that are created and fixed in print, electronic, fax, CD-ROM, DVD, and other formats now known, or later developed are protected as well. Even email that you send and receive is protected. Usenet’s and other World Wide Web services also contain copyrighted material. In certain advanced legislations, "raw facts" (e.g., a particular gene sequence) are also protected.

Copyright protects to authors and owners from plagiarism. Copyright protects to authors and owners from dishonest competition. Copyright can be transferred. Transfers of exclusive rights must be made in writing.

The contents of the site, including the text, graphics, images, logos, button icons, HTML, XML, LaTeX, CSS, JavaScript code, sounds, multimedia, and other electronic materials are copyrighted. Permission to use content may be granted on a case-by-case basis. Please direct me any request to use content by clicking on the next link: contact.

The site may contain material by third parties, which can are subjected to own rights. The site is not responsible for material by third parties.

Changes to these policies

We reserve the right to change these policies at any time and at our sole discretion. Any changes will be effective upon posting online, unless we specify a different effective date when we make a particular change. You are responsible for checking for policy updates.

Date: 2023 September 26, 12:19.