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Martin Heimann <martin.heimann@XXXXXXX.de> wrote:Liebe Kollegen, Eine Moeglichkeit ist: Unprotect[Equal]; HoldPattern[Equal[z__]*(x_) /; FreeQ[x, Equal]] ^:= Thread[x*eq[z], eq] /. eq -> Equal; HoldPattern[Equal[z__]*(x_) /; FreeQ[x, Equal]] ^:= Thread[x*eq[z], eq] /. eq -> Equal; HoldPattern[Equal[z__] + Equal[v__]] ^:= Equal @@ ({z} + {v}); HoldPattern[Equal[z__] + (x_) /; FreeQ[x, Equal]] ^:= Thread[x + eq[z], eq] /. eq -> Equal; Equal/: HoldPattern[Equal[z__]^(n_Integer)] := Thread[eq[z]^n, eq] /. eq -> Equal; Protect[Equal]; Dann: In[8]:= (a==b) + (c==d) Out[8]= a + c == b + d In[9]:= 2 (a==b) Out[9]= 2 a == 2 b In[10]:= (x==y)^2 2 2 Out[10]= x == y In[11]:= 2 + (a==b) Out[11]= 2 + a == 2 + b Unten habe ich obige Definitionen in einen button gebracht (wobei jedoch nichts mehr im Global` Context definiert wird). MfG, Rolf Mertig P.s.: Natuerlich ist das nur mit Vorsicht zu gebrauchen ... 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