Abstract

According to the new family of theories that emerged around the second half of the nineteenth century, time is more similar to space than it had been construed to be under the previous family of theories. These new theories of time treat time as being a “fourth dimension” that is much more like the three spatial dimensions than it was imagined to be under the older rival theories. Over the two centuries following Newton, the key concepts of graphs and the differential and integral calculus, trickled out into a wide intellectual community. Mc Taggart's theorem purports to be a disproof of all the old theories of time – on the grounds that they are logically inconsistent. It also purports to be a disproof of all the new theories of time – on the grounds that what they describe as “time” is simply not time, properly so‐called.