In mathematics, the ABC conjecture relates the prime factors of two integers to those of their sum. It was proposed by David Masser and Joseph Oesterlé in 1985. It is connected with other problems of number theory: for example, the truth of the ABC conjecture would provide a new proof of Fermat's Last Theorem.
Define the radical of an integer to be the product of its distinct prime factors
Suppose now that the equation holds for coprime integers . The conjecture asserts that for every there exists such that
A weaker form of the conjecture states that
If we define
then it is known that as .
Baker introduced a more refined version of the conjecture in 1998. Assume as before that holds for coprime integers . Let be the radical of and the number of distinct prime factors of . Then there is an absolute constant such that
This form of the conjecture would give very strong bounds in the method of linear forms in logarithms.
It is known that there is an effectively computable such that