When we mention the simple Arabic numeral "84", perhaps few people stop to think about the cultural connotation and special value it carries. However, in the long history, "84" is not only an ordinary counting unit, but also contains many unknown secrets.

In the records of ancient civilizations, we can trace many myths and legends about "84. For example, in traditional Chinese culture, Taoism believes that there are 84 immortals in the sky to guard the order of the world. In the Hindu system, "Mahamantra (Mahamantra)" repeats 108 times based on the completion of 84 cycles in each round. All these examples show that the ancients gave the value a sacred status.

So what makes people pay so much attention to "84"? First of all, from a mathematical point of view, this is a very special set of integers-it is the result of the multiplication of two consecutive prime numbers (ie 2 × 2 × 3 × 7). In addition, it has a strong decomposition ability, so it often appears as a benchmark parameter in various permutation problems.

Into real life, "84" is also everywhere and full of fun. For example, the football match time in a sports event is exactly set to 90 minutes plus the stoppage time period is also about the fluctuation around this interval. Or the common quarter note beat speed setting in music rhythm is usually close to about 90 beats per minute, which just corresponds to the length of two complete cycles equal to about... Eighty seconds! Small discoveries like these remind us that even seemingly mundane things can harbor profound wisdom.

Not only that, in the field of scientific research, "84" also plays an important role. Chemists have long determined that the atomic number of krypton (Kr) element is exactly the 84th member. However, the physics community has concluded through precise calculations that the approximate value of the photon number density proportional relation under the condition that the temperature peak of cosmic microwave background radiation is about 2.7 kelvin falls exactly near the same range.

Looking at this issue from the perspective of philosophy, "84" seems to be a bridge between the limited world and the infinite possibility. Just like Zhuang Zhou's dream butterfly, which is difficult to distinguish between the actual and the actual but interesting, the cognitive differences of each individual for the same thing have created a rich and colorful map of human thought. So the next time you encounter this ordinary but magical number, please try to stop and get to know it again-maybe there will be unexpected new gains.