Okay, math lovers, this is the one you've been waiting for: Shinichi Mochizuki of Kyoto University in Japan is claiming to have found proof (divided into four separate studies with 500+ pages) of the so-called *abc* conjecture, a longstanding problem in number theory which predicts that a relationship exists between prime numbers. The tricky part? Now other mathematicians need to dig into his extensive work, and confirm that he's right.

Now, because I failed grade 9 math, I'm going to let Philip Ball of *Nature News* explain this one to you:

Like Fermat's theorem, the

abcconjecture refers to equations of the form a+b=c. It involves the concept of a square-free number: one that cannot be divided by the square of any number. Fifteen and 17 are square free-numbers, but 16 and 18 - being divisible by 42 and 32, respectively - are not.The 'square-free' part of a number n, sqp(n), is the largest square-free number that can be formed by multiplying the factors of n that are prime numbers. For instance, sqp(18)=2×3=6.

If you've got that, then you should get the

abcconjecture. It concerns a property of the product of the three integers axbxc, or abc - or more specifically, of the square-free part of this product, which involves their distinct prime factors. It states that for integers a+b=c, the ratio of sqp(abc)r/c always has some minimum value greater than zero for any value of r greater than 1. For example, if a=3 and b=125, so that c=128, then sqp(abc)=30 and sqp(abc)2/c = 900/128. In this case, in which r=2, sqp(abc)r/c is nearly always greater than 1, and always greater than zero.

If you don't get any of that or what Mochizuki has done, don't worry — many mathematicians don't either. And in fact, Mochizuki is considered somewhat of a genius and a guy who's in a league of his own. He thinks in terms of mathematical 'objects' — abstract entities like geometric objects, sets, permutations, topologies, and matricies. Ball quotes mathematician Dorian Goldfeld as saying, "At this point, he is probably the only one that knows it all."

Read more at *Nature News*, and check out the three studies — if you dare: I, II, III, IV.

*Image via **Shutterstock.com**/ronstik.*

## DISCUSSION

You need to fix your formatting in the block quote. Toward the end of the first paragraph, 42 and 32 should read 4^2 and 3^2.