!set methtit2=Algebraic rewriting of an expression
!set methtit=Rewrite an expression
!set methenv=ZZ QQ RR CC
!set methparmtype=parm algexp nocomma nonesting, function
!set methhelp=Deduction by algebraic rewriting. Only arithmetic equivalences\
 are accepted in this rewriting.

!if $wims_read_parm iswordof form check
  !goto $wims_read_parm
!endif

!exit
:form
Rewrite the expression
!read deduc/methparm.phtml 1
$ into
!read deduc/methparm.phtml 2,20
!set methremark=Only arithmetic equivalences are accepted in this\
  rewriting.
!exit
:check
!distribute items $methparmobj1 into data,exp
!read deduc/sub/checkzero ($exp)-($methparm2)
!if $out=$empty
  error=bad_data
  !exit
!endif
!if $out!=yes
  error=unjustified
  !exit
!endif
methexp=Rewriting of \($exp)

newobject1=$methparm2
oldobject=1

!exit
