will collapse, while a Jeans-stable clump will be supported. However, although the ratio of the gravitational and pressure forces is approximately independent of the separation of the particles, the magnitude of the gravitational force decreases with separation due to the softening. Thus, while a Jeans-unstable clump of gas with a size much larger than the resolution length, $h$, will collapse at the correct rate, the collapse of clumps with a size $\approx h$ will be delayed. This is demonstrated in Figure \[bate.massden\].

Unfortunately, the effect is not always limited to a simple delay of the collapse. Given the right problem, artificial fragmentation can be induced (such as with the filament described above), or inhibited. In Figure \[bate.80000\] we show how the collapse of a particular molecular cloud core with an initial $m=2$ density perturbation results in a binary protostellar system with a bar of gas between them. This calculation was performed with $8\times 10^4$ particles, enough to resolved the Jeans mass/length until after the binary had formed. However, performing the same calculation with $1\times 10^4$ particles gives a different result: a single, dense bar of gas without the binary. In this calculation, the Jeans mass becomes unresolved before $t=1.20$ and 