Scott No: -
Serial number: 2025-4
Values in set: 4
Date of issue: March 14th, 2025
Denomination: 470 fen
Designer: Xia Jingqiu
Size of stamps: 36 * 36 mm
Perforation: 13.5
Sheet composition:
16 for Sheet I;
8 for Sheet II
Size of sheet:
210 * 188 mm for Sheet I;
190 * 128 mm for Sheet II
Printing process: Offset
Printing House: Beijing Postage Stamp Printing Works

China Post is scheduled to issue a set of 4 special stamps themed "The Beauty of Mathematics" on March 14, 2025. The stamps are titled Pi, Pythagorean Theorem, Euler's Formula and Möbius Strip respectively. The total face value of the complete set is 4.70 yuan, with a planned issuance of 6.25 million complete sets and 0.8 million sheetlets of the second format.

General Secretary Xi Jinping pointed out at the Scientists' Forum that efforts should be made to strengthen the development of basic disciplines such as mathematics, physics, chemistry and biology. As a key discipline in basic research, mathematics is one of the sources of scientific and technological innovation. From the microcosmic atomic structure to the macroscopic operation of celestial bodies, mathematics provides an accurate way of description. It serves as a tool for us to communicate with nature and a key to exploring the mysteries of the world.

The set of stamps boasts a modern and striking design style. The first stamp, Pi, is a well - known mathematical constant that runs through many disciplines including geometry and physics. The design incorporates the essential definition of Pi. It uses ultra - fine lines to present the classic ancient circle - cutting method for calculating Pi, and displays the 996 digits after the decimal point of Pi in microtext on the stamp. In particular, the first 7 digits are highlighted in orange to honor Zu Chongzhi, a mathematician of China's Northern and Southern Dynasties. The second stamp, Pythagorean Theorem, represents one of the achievements of ancient Chinese geometry. It clarifies the length relationship among the three sides of a right - triangle, stating that the sum of the squares of the lengths of the two legs is equal to the square of the length of the hypotenuse. Partial hot stamping technology is adopted on the stamp to show the theorem's proof process through a layered visual effect. The third stamp, Euler's Formula (eiπ + 1 = 0), is hailed as "one of the most beautiful formulas in mathematics". The stamp uses graphic expressions to demonstrate how Euler's Formula connects five important mathematical constants (e, i, π, 1, 0). The pattern of "Euler's Eye" on the stamp adopts micro - processing technology, integrating these five constants with anti - counterfeiting technology. The fourth stamp, Möbius Strip, is a magical topological shape with only one surface and one boundary. Partial hot stamping is also used on this stamp, and the rich color changes vividly present the multi - dimensional properties of the Möbius Strip. Under ultraviolet light, the ant tracks on the stamp echo the Milky Way at the bottom of the picture, symbolizing the gradual expansion from the microcosmic field to the broader macrocosmic realm.

The printing technology of the stamps is developed around the displayed content and enhanced based on the image effect, integrating artistry, scientificity and anti - counterfeiting performance. The daylight - type fluorescent ink, used for the first time on stamps, shows different fluorescent effects under daylight and ultraviolet light. This multi - dimensional visual effect of the stamps echoes the multi - dimensional nature of mathematical knowledge. The printing of ultra - fine lines has broken the record for the printing precision of stamps, and the high - precision printing technology reflects the rigor of mathematics. The special key - shaped perforations are designed under the inspiration of the famous saying that "mathematics is the key to unlocking the door to science", implying that mathematics can help people solve scientific mysteries.

This set of stamps is designed by Xia Jingqiu, edited by Liu Jian, and printed by Beijing Stamp Printing Co., Ltd. using offset printing technology. Besides, partial hot stamping technology is applied to the second and fourth stamps.