Washoku is a traditional Japanese cuisine.

This room gives a sense of peace.

This room has a Japanese-style atmosphere.

Understanding geometric series is important in learning the basics of advanced mathematics.

Calculating infinite series is one of the more difficult parts of mathematics.

Problems about arithmetic series often appear in math tests.

Understanding geometric series is important for understanding mathematics.

The harmonic series continues indefinitely, but its sum is not finite.

It's difficult to solve this formula.

He solved complex mathematical problems using his new calculator.