Distinquishing #'s in nested pure functions

*To*: mathgroup at smc.vnet.net*Subject*: [mg126249] Distinquishing #'s in nested pure functions*From*: "Dave Snead" <dsnead6 at charter.net>*Date*: Fri, 27 Apr 2012 06:48:11 -0400 (EDT)*Delivered-to*: l-mathgroup@mail-archive0.wolfram.com*References*: <201204260933.FAA05752@smc.vnet.net>

Hi, Is there a way to distinguish the #'s in nested pure functions? As a simple example: f[x_, y_] := x - y Select[{1, 2, 3}, (f[#, #] & /@ {-1, -2, -3}) == {3, 4, 5} &] I want the 1st # to correspond with the outer & (the equal) and the 2nd # with the inner & (the map) The answer in this example should by {2} (of course, the statement as written above does not do the job) Can Mathematica distinguish these #'s? Thanks in advance, Dave Snead

**Follow-Ups**:**Re: Distinquishing #'s in nested pure functions***From:*Murray Eisenberg <murray@math.umass.edu>

**Re: Distinquishing #'s in nested pure functions***From:*Sseziwa Mukasa <mukasa@gmail.com>

**References**:**NonlinearModelFit and Complex Data***From:*Maria <rouelli@gmail.com>