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Primary school mathematics only learns one or two levels of operation. The operation of grade three and grade four in junior high school can't be learned in university.
Level 1: plus sign (+) and minus sign (-).
The second level: multiply (×) and divide ().
Three levels: power (), root (√) and log.
Four levels: iterative power (or super power, super power), super root, super logarithm.
Very simple, continuous addition is multiplication, continuous multiplication is power, then the four-level operation is continuous power. And so on, there are homework for grades five and six. The (n+ 1) th operation is the nth consecutive operation. For example, the fourth-level operations of 3 and 4 are expressed as four 3-phase powers. The fifth power of 3 is the multiplication of 5 3. If it is a five-level operation of 3 and 4, it is a four-level operation of 4 3s. The symbol of the nth operation is n-2 arrows. The abbreviation is ↑(n-2) (superscript).
However, the number of operations at level 4 and above can greatly break through the sky. As far as two 3s are concerned, the first level is only 6, the second level is 9, the third level is only 27, and the fourth level becomes 762559484987. The three-level operation of 2 and 6 is equal to 64, and the four-level operation becomes a number with about 6× 10 19727 digits. If A = B = N, knowing b and n, finding a is called superlogarithm, knowing a and n, finding b is called superlogarithm.