Member benefits to deepen your learning.
you can enjoy a variety of benefits,
including access to members-only content,
use of AI Tutor, downloadable PDF textbooks,
and participation in forums and study groups.
Membership Benefits
Members-Only Content
Access exclusive content designed to help you deepen your learning.
- View proofs of propositions and theorems
- Access answers and explanations for exercises
- Access members-only learning materials and resources
AI Tutor
Use an AI-powered learning assistant to deepen your understanding.
- Ask questions about the learning materials
- Get suggestions for study methods and learning plans
- Discover related materials and learning topics
Community Features
Connect with other learners and take part in discussions and research.
- Ask questions and exchange ideas in the forums
- Join topic-based discussions in study groups
- Use profile and group features
PDF Textbooks
Download and use learning materials in PDF format.
- Study even when you are offline
- Access systematically organized learning materials
- Continue using updated editions after publication
Premium Membership
Premium Membership is our standard plan for learners who want to make full use of the WIIS learning environment and pursue systematic study.
(Approx. US$6 per month)
You can cancel at any time. You will continue to have access to your membership benefits until the end of your current subscription period.
Members-Only Content
Access exclusive content designed to help you deepen your learning.
AI Tutor
Use an AI-powered learning assistant to deepen your understanding.
Community Features
Connect with other learners and take part in discussions and research.
PDF Textbooks
Download and use learning materials in PDF format.
Supporter Membership
for those who wish to contribute to
and support the activities of WIIS.
Your support helps sustain
the ongoing development and operation of WIIS,
including the writing and
updating of educational materials,
the operation of AI Tutor,
and the maintenance of the community
and study groups.
Frequently Asked Questions
What is the difference between a free membership and a paid membership?
Premium Membership is the standard plan for accessing WIIS learning features. It includes members-only content, AI Tutor, PDF textbooks, community features, and more.
Supporter Membership includes all Premium Membership features, plus access to the WIIS monthly operations report and optional listing on the Supporters page.
It is also a way to support the continued development of educational materials and the ongoing operation of WIIS.
Can I cancel at any time?
Yes. You can use the membership on a month-to-month basis.
What is the difference between Premium Membership and Supporter Membership?
Paid members can access members-only content, AI Tutor, PDF textbooks, community features, and other benefits.
What payment methods are available?
You can pay by credit card or PayPal.
How often can I use AI Tutor?
During the trial period, AI Tutor can be used up to 10 times per day.