Five Star Gift Ideas

Based on the given input, I can see that your girlfriend has a strong liking for mathematics, specifically algebraic equations. This gives us a good starting point for finding a meaningful and personal anniversary gift that relates to her interest.

Here are a few gift ideas that you could consider:

1. Customized Equation Jewelry: Consider getting a piece of jewelry, such as a necklace or bracelet, with a pendant shaped like her favorite algebraic equation. You can collaborate with a jewelry designer who can create a beautiful and delicate piece showcasing her equation.

2. Math-Inspired Art: Look for unique art pieces that incorporate mathematical equations or patterns. There are many artists who create visually appealing artwork using mathematical formulas as inspiration. This could be a thoughtful and creative gift that would also make a great addition to her living space.

3. Subscription to a Math Magazine or Journal: If your girlfriend enjoys reading about mathematics, consider gifting her a subscription to a math-based magazine or journal. This way, she can stay updated with the latest developments in the field and indulge in articles that align with her interests.

4. Enroll her in a Math Workshop or Course: Look for local math workshops or online courses that offer classes focused on algebra or other specific branches of mathematics. This gift would not only showcase your support for her passion but also provide her with an opportunity to learn and explore new mathematical concepts.

5. Mathematical Puzzle or Game: There are numerous puzzles, games, and brain teasers available that revolve around mathematical principles. Consider getting her a challenging yet entertaining puzzle that she can engage with during her free time. It will not only cater to her interest but also provide a fun and engaging activity.

6. Visit a Math Museum or Exhibition: Research if there are any math-related exhibitions or interactive math museums in your area. Plan a surprise visit for the two of you to explore and discover the wonders of mathematics together. Spending quality time while immersing yourselves in her favorite subject would surely make for a memorable anniversary experience.

It's important to remember that the most meaningful gift is the one that shows your thoughtfulness and consideration for her interests. By choosing a gift that aligns with her passion for mathematics, you can demonstrate your support and love in a unique and personalized way.

Or you can get her a star map with the date of your anniversary.