有形数
![](/Images/godic/202501/13/TriNumbers.svg1912.png")
![](/Images/godic/202501/13/Nombre_pentagon_cent.svg1912.png")
![](/Images/godic/202501/13/Square_pyramidal_number.svg1912.png")
![](/Images/godic/202501/13/Triangle10.svg1912.png")
有形数是可以排成有一定规律形状的数。有形数是毕达哥拉斯学派的关注重点之一，他们认为数和形有不可分割的关系。有形数都是自然数，它们可以用小石子堆砌。有形数是将数形象化的方法。
一般地，任意一个自然数都可以表示为m个m边形数的和。
Figurate number
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Figurate number 有形数
The term figurate number is used by different writers for members of different sets of numbers, generalizing from triangular numbers to different shapes (polygonal numbers) and different dimensions (polyhedral numbers). The term can mean
- cooling water connection
- cooling water consumption
- cooling water control
- cooling water discharge
- cooling water discharge box
- cooling water discharge manifold
- cooling water expansion tank
- cooling water flow
- cooling water flow stoppage protection
- cooling water head tank
- cooling water heat exchange
- cooling water inlet
- cooling water inlet pipe
- cooling water inlet temperature
- cooling water in place of chimney combining tower
- cooling water jacket
- cooling water joint
- cooling water leakage detector
- cooling water manifold
- cooling water monitoring
- cooling water outlet
- cooling water outlet and inlet
- cooling water outlet pipe
- cooling water outlet temperature
- cooling water pipe