imprint - legal - GDPR

Guido Lutterbach email:



All information provided on this site is provided "as is", with no implication about correctness of information or usability. This means: use at your own risk. You cannot hold liable for any damage that may, directly or indirectly arise from imitating activities portrayed on this site.


This page uses lektor, with a BSD license found here. This page also uses a slightly modified version of ASCIIMathML.js, with a MIT license.


All images on are copyrighted by © Guido Lutterbach.


The Web Site may contain links to other Web Sites ("Linked Sites"). The Linked Sites are not under the control of and is not responsible for the contents of any Linked Site, including without limitation any link contained in a Linked Site, or any changes or updates to a Linked Site. is not responsible for webcasting or any other form of transmission received from any Linked Site. is providing these links to you only as a convenience, and the inclusion of any link does not imply endorsement by of the site or any association with its operators.


The names of actual companies and products mentioned herein may be the trademarks of their respective owners. The example companies, organizations, products, people and events depicted herein are fictitious. No association with any real company, organization, product, person, or event is intended or should be inferred. Any rights not expressly granted herein are reserved.

GDPR - Privacy and Data Protection

Dear visitor of this site, I, Guido Lutterbach, contact details on top, am resonsible for the protection of your personal data on this page, according to the GDPR.

This website can be used without divulging of personal data. I don't care how you arrived at this site, how long you stay, which buttons you press and where you go to afterwards. There are no ads, which could be personalized, neither is there some status that needs to be remembered. That's why I don't use cookies, programs or files implementing this functionality or doing this kind of analysis. In case you don't know what cookies are, please consult Wikipedia. Since I don't use them, I don't want to explain it here.

Your browser automatically forwards information to the servers whose pages you are visiting. Same as here. This information is: IP address of requesting client, Type and version of browser, the operating system, referring URL and the time of access to the page. To gather this information is legitimate, for example for assuring smooth service of the website.

Solely the IP address can be assigned to you and makes all this information personal data.

I have turned off logging of complete IP addresses, so that only an anonymized version is kept together with the other data. It can no more be connected to a specific person. This data will not be shared with others (except lawful measures) and will be deleted after 90 days. I also signed a contract with my webhosting provider that he will also act according to the GDPR.

Your email address is a personal date also. I only get to know it when you are sending me an email directly, thus giving me permission to know it and securely process it. I will never forward your email address to anybody (except lawful measures or your explicit permission) and will take measures to prevent data theft.

You can contact me by mail and ask for your personal data under my control. You will receive a machine-readable record of that data in a timely manner (within 30 days). You can also demand the deletion of your data, if that does not contradict legal requirements. Feel free to contact me if you have further questions regarding the realization of data protection measures. On further visit of my site you accept the implications of this data privacy statement. Please leave this site if you do not agree. Future changes in data protection regulation will be adopted in this statement.

Thank you for your understanding!