• in Chrome (works best): http://www.geogebra.org/chrome
• or in other browsers: http://app.geogebra.org

Today we are announcing the new Spreadsheet view in GeoGebraWeb. You now have the Algebra, Graphics and Spreadsheet view available in your web browser, all based on HTML5 without the need for any plugins. It is now also working in 44 languages (with Hindi as a new language) and variants.

Our development team is continuously working to make GeoGebraWeb better, faster and add more and more functionality of our desktop application. It would be great if you could give us feedback and suggestions in our GeoGebraWeb User Forum.

What is working now:

• Graphics, algebra, and spreadsheet view
• Tools and style bar of the graphics view
• Input bar
• Open and save ggb files, also with Google Drive

What is coming next in GeoGebraWeb:

• Right-click menus
• Properties dialogs
• CAS view
• …

Balazs Koren and Zoltan Kovacs of the International GeoGebra Institute (IGI) lead a series of interactive presentations from 4:00 – 7:00 p.m. The primary aim of the meeting is to introduce participants to the software, share teaching ideas, and build community.

Participants need to bring laptops in order to fully engage in the workshop activities. Light dinner will be provided (RSVP required; email Joanne.RossiBecker at sjsu dot edu by Oct 15 to reserve your seat).

For more information write a comment here or send an e-mail to balazs at geogebra org.

You can download the flyer in .jpg or .pdf format. Please share the information about the workshop. We are looking forward to meet you in San Jose.

Zoltan, Balazs and the local organizers, Joanne and Ferdinand.

P.S.: Thank you @mtoddedwards for the flyer.

Visit the Chrome Web Store and search for GeoGebra. Two Apps are there in the Store, one for the GeoGebraTube and the shiny new GeoGebra Web App.

After installing and launching the application, you should allow the app access to your Google Drive:

The app looks almost identical to the Java version:

And it not only looks like the Java version, but works like it too:

As a nice extra, today we’ve added Edit -> Insert Image from -> Webcam. You can then rotate/reflect/etc the image as you can do when you insert an image in the Java version.
You have to enable a flag in Chrome for this to work at the moment, details here:
http://www.geogebra.org/forum/viewtopic.php?f=48&t=27868

What is working:

Bonus features that the Java version doesn’t have:

We hope to soon start work on adding:

Even during the last week there were lots of improvements on the user interface. Now GeoGebra accepts statements in a∥b, c⊥d, E≟F (or E==F) format, and both segments and lines can be used in many proofs. The non-degeneracy conditions are also reported for almost all investigations. These are maybe nuances for a researcher, but important details for most users, for example students: GeoGebra must be intuitive in all subtopics of the mathematics. This is what we try to focus on: to ease understanding of difficult things.

This screenshot shows a non-degeneracy condition for the triangle midsegment theorem: if the points A and B are different, then the theorem is true. Here we used the "parallel" sign to define the statement. The URL shows that Google hosts the web version of GeoGebra, but also an offline version can be installed for the Google Chrome browser.

Ted Kosan, a pioneer of converting computer algebra systems from different languages to others, was one of the first hard worker in this long story. Ted, the lead developer of MathPiper, also did a great effort on converting YaCAS into Java, back in 2008. Because of Reduce has been open sourced since December 2008, and a Java interface (JLisp) was also available for it, Ted decided to try to convert it to JavaScript by using the Google Web Toolkit “Java to JavaScript” compiler (GWT). His adventure was inspired by Gábor Ancsin, a former web designer, who had surprisingly great results in compiling the GeoGebra source code into JavaScript with GWT. Now Ted’s work is a part of Reduce under the name “JSLisp“, and it is also built into GeoGebra as “GGBReduce“. With Ted’s help we have been using the Java version of Reduce by inserting its bytecode stream for the desktop platform, and finally we were also able to put the same bytecode into GeoGebraWeb as a static text. (In fact, Ted was already finished with his prototype back in May 2011.)

To try it out, the user should simply go to the alpha test page of the web platform version of GeoGebra. Then enter

f(x)=x^2*sin(x)

into the input box, press ENTER, and as another command, enter

g(x)=f'(x)

In some seconds (depending on the internet connection and the machine speed, and also the browser) the output g(x)=x^2*cos(x)+2x*sin(x) will be shown in the Algebra View on the left. Google Chrome users may want to try to install GeoGebra from the Google webstore as well to make all of this work offline on their workstation, too.

Yes! No magic any longer – a full featured computer algebra system fits in HTML5 and JavaScript. The next step is to do it faster – to offer convenient use for smartphone users as well. A smartphone can be really slow, and have just limited resources, so this sounds another great challenge.