Goldbach (哥德巴赫) was a great mathematician (数学家). In 1742, he came up with (想出) a new math problem. But he could not solve it. Many other mathematicians tried, but they all failed. More than 200 years later, a Chinese mathematician named Chen Jingrun (陈景润) found a way to partly (部分地) solve the problem. The world was excited about it.