Logiweb aspects of double negation in pyk

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The user defined "the statement aspect" aspect

define statement of double negation as system s infer all metavar var a end metavar indeed all metavar var b end metavar indeed not metavar var b end metavar imply not metavar var a end metavar infer not metavar var b end metavar imply metavar var a end metavar infer metavar var b end metavar end define

The user defined "the proof aspect" aspect

define proof of double negation as rule tactic end define