$\sigma _{0}(n)=\sigma _{0}(n+1)$ will occur infinitely often.

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In 1984, Roger Heath-Brown proved that will occur $\sigma _{0}(n)=\sigma _{0}(n+1)$ infinitely often. How did he prove that? I couldn't find the paper on the internet.

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The paper is probably

The divisor function at consecutive integers, Mathematika, 31 (1984), 141–149

This is not freely available, unfortunately.

See also this paper by Hildebrand which extends Heath-Brown's and is freely available:

The divisor function at consecutive integers, Pacific Journal of Mathematics, 129 (1987) 307–319