Mathematical Zen

In 1974 Frank Harary and Ronald C. Read published a paper with the incredible title, “Is the null-graph a pointless concept?”

The abstract reads as follows.

The graph with no points and no lines is discussed critically. Arguments for and against its official admittance as a graph are presented. This is accompanied by an extensive survey of the literature. Paradoxical properties of the null-graph are noted. No conclusion is reached.