Put and . The hypothesis implies . For the number of isolated vertices, the isolated vertices in the Erdős-Rényi model formulas give
Thus the Chebyshev inequality gives with high probability, uniformly over the specified range.
The Cayley formula supplies a spanning tree on any connected vertex set. Consequently the expected value of the number of graph components of order is bounded by
Choose a fixed with . For , with , the binomial coefficient bound gives
Here . The geometric series and a union bound therefore exclude this entire size range, since . For , an empty graph cut would be necessary. Its total probability is at most
There are consequently no graph components of orders between and , with high probability.
For each fixed , a graph component containing a graph cycle has a spanning tree and at least one extra edge. Counting that extra edge gives an expected value ; hence every small graph component is a tree component. The total number of vertices in tree components of orders satisfies
The Markov inequality gives with high probability. When , this sum is empty and . Since , the remaining vertices must lie in one graph component larger than . It is unique, and its order is . Every other graph component is a tree with at most vertices. This is the logarithmic-regime giant component mechanism: almost all missing vertices are isolated.