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## com.meyling.principia.logic.rule
Class RenameFreeSubjectVariable

    java.lang.Object
      com.meyling.principia.argument.AbstractArgument
          com.meyling.principia.argument.AbstractArgumentList
              com.meyling.principia.logic.rule.RenameFreeSubjectVariable

All Implemented Interfaces:
  Argument, Rule

public class RenameFreeSubjectVariable
extends AbstractArgumentList
implements Argument, Rule

Replace a free subject variable by another subject variable:

`A[x]`

`x is free in A[x]`

`y is not bound in A[x]`

`----------------------`

`A[y]`

Version:
  $Revision: 1.8 $
Author:
  Michael Meyling

Constructor Summary
`RenameFreeSubjectVariable(Argument[] arguments)` Constructs a replace predicate variable rule.

Method Summary
`Rule` | `changeProofLines(int[] mapping)` Get proof line numbers that are used to derive the new formula.
`void` | `check(Module module, ProofLineList proofLines, int position, Formula formula)` Check if proof could be extended with formula by replacing a free subject variable of a proof line by another subject variable.
`static void` | `checkDeclaration(Module module, RuleDeclaration declaration)` Check this rule could be declared.
`Argument` | `create(Argument[] arguments)` Create a new Argument with given arguments.
`ProofLineList` | `extendWithout(Module module, ProofLineList proofLines, int position)` Return proof lines that could replace the proof line `position`.
`int[]` | `getProofLines()` Get proof line numbers that are used to derive the new formula.
`Version` | `getVersion()` Get version of this rule.
`String` | `toString()` Get the argument in `String` form.

Methods inherited from class com.meyling.principia.argument.AbstractArgumentList
`copy, getArgument, getArgumentSize`

Methods inherited from class com.meyling.principia.argument.AbstractArgument
`containsPatternVariables, equals, getHighestNumber, getPatternVariables, getReplacementParents, getSearchParents, hashCode, matches, matches, replace, replace, replace, replaceMatches`

Methods inherited from class java.lang.Object
`clone, finalize, getClass, notify, notifyAll, wait, wait, wait`

Methods inherited from interface com.meyling.principia.argument.Argument
`containsPatternVariables, copy, equals, getArgument, getArgumentSize, getPatternVariables, getReplacementParents, getSearchParents, hashCode, matches, matches, replace, replace, replace, replaceMatches`

Constructor Detail

### RenameFreeSubjectVariable

    public RenameFreeSubjectVariable(Argument[] arguments)
                              throws ArgumentException

  Constructs a replace predicate variable rule.

Parameters:
  `arguments` -
  - 0:Counter, as proof line reference (>0)
  - 1: subject variable
  - 2: another subject variable
Throws:
  `ArgumentException` - if there are not exactly three arguments or the arguments are no instances of `Counter`, `SubjectVariable`, `SubjectVariable` in exactly this order.

Method Detail

### check

    public final void check(Module module,
                            ProofLineList proofLines,
                            int position,
                            Formula formula)
                     throws ArgumentException

  Check if proof could be extended with formula by replacing a free subject variable of a proof line by another subject variable.

  Specified by:
    `check` in interface `Rule`
  Parameters:
    `module` - module
    `proofLines` - proof lines
    `position` - number of proof lines that could be used in the rule
    `formula` - formula to add
  Throws:
    `ArgumentException` - if addition is not possible because the proof line number is not allowed (e.g. between 1 and the minimum of `position` and current maximum proof line number) or the referenced proof line does not contain the free subject variable that shall be found or the replacement subject variable is already an bound subject variable of the proof line or the resulting formula is not equal to `formula` or a version conflict occurs

### extendWithout

    public ProofLineList extendWithout(Module module,
                                       ProofLineList proofLines,
                                       int position)
                                throws UnsupportedOperationException

  Description copied from interface: `Rule`
  Return proof lines that could replace the proof line `position`.

  Specified by:
    `extendWithout` in interface `Rule`
  Parameters:
    `module` - the belonging module
    `proofLines` - proof lines
    `position` - referenced proof line (starting with 0) in `proofLines`
  Returns:
    proof lines that could substitute the single proof line `position`
  Throws:
    `UnsupportedOperationException` - if this rule couldn't be reduced at all because it is a basic rule

### getProofLines

    public int[] getProofLines()

  Description copied from interface: `Rule`
  Get proof line numbers that are used to derive the new formula.

  Specified by:
    `getProofLines` in interface `Rule`
  Returns:
    numbers of involved proof lines

### changeProofLines

    public Rule changeProofLines(int[] mapping)

  Description copied from interface: `Rule`
  Get proof line numbers that are used to derive the new formula.

  Specified by:
    `changeProofLines` in interface `Rule`
  Parameters:
    `mapping` - array that maps old proof line numbers (index) to new ones (value)
  Returns:
    same rule but with changed numbers of involved proof lines

### checkDeclaration

    public static final void checkDeclaration(Module module,
                                              RuleDeclaration declaration)
                                       throws ArgumentException

  Check this rule could be declared.

  Parameters:
    `module` - the module context
    `declaration` - the declaration that shall declare this rule
  Throws:
    `IllegalArgumentException` - if an programming error occured
    `ArgumentException` - if declaration failed

### getVersion

    public final Version getVersion()

  Description copied from interface: `Rule`
  Get version of this rule.

  Specified by:
    `getVersion` in interface `Rule`
  Returns:
    rule version

### create

    public final Argument create(Argument[] arguments)
                          throws ArgumentException

  Description copied from interface: `Argument`
  Create a new Argument with given arguments.

  Specified by:
    `create` in interface `Argument`
  Specified by:
    `create` in class `AbstractArgumentList`
  Throws:
    `ArgumentException`

### toString

    public final String toString()

  Description copied from interface: `Argument`
  Get the argument in `String` form.

  Specified by:
    `toString` in interface `Argument`
  Specified by:
    `toString` in class `AbstractArgumentList`

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