The name is absent

N¹_g           ⅛           Nf

And the force of interaction between the grafted surfaces is

' ^N_g              N'l              Nf

-∑P√⅞)-∑Pλ⅞)-∑∕bφ

3=2          J=I          J=I

w;           гя           и,

-∑ft⅛)-∑ft(¾-∑ft(⅞)

3=2          j=l          j=l

where, H → ∞ implies the limit when the separation between the two surfaces is
large enough that they do not interact with each other.

179

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