eMath Products

eMath Textbooks for 4f Studio

Buy eMath 1 - eMath 10 high school mathematics textbooks in the 4Ferries Webshop. The textbooks are downloaded to the textbook shelf in 4f Studio. Requires an active 4f Studio subscription.


eMath Textbook     9.95 €  each

(price includes VAT 24 %)

eMath Checker for 4f Studio

Buy checker quota for using eMath Checker in eMath Editor. Requires an active 4f Studio subscription. Get started with the 100 checks quota. Buy the 250 checks quota for more extensive use.





100 checks     9.95 €

250 checks     19.95 €

(price includes VAT 24 %)

eMath Textbooks for Tablets

Buy eMath textbook apps for iPad tablets at AppStore and for Android tablets at Google Play.





Check prices at AppStore and Google Play

Structured Derivations Textbooks

Buy textbooks on structured derivations on Amazon.


     Ralph-Johan Back: Structured Derivations: Teaching Mathematical Reasoning in High School  (Four Ferries Publishing, 2015)

     Ralph-Johan Back: Teaching Mathematics in the Digital Age with Structured Derivations (Four Ferries Publishing, 2016)


 Check prices on Amazon.