After deciding to attempt to prove the Goldbach Conjecture using two methods, Zhao Yi felt a sense of relief. Not having to make a choice was always best, even if it meant spending a few more Study Coins and taxing his brain a bit more.
If one way proved impassable halfway, he could always switch to the other path that was more promising.
And with that, he began to think.
He had previously thought more about the second method: establishing a central line and viewing a large enough number, N, as the said central line.
If the number N is a prime number, then its double would be an even number, which could naturally be expressed as the sum of two prime numbers.
If the number N is not a prime number, then the task would be to take the prime number N as the central line and find all the symmetrical numbers of prime numbers around it.
With that, he could begin his analysis.