by t let id:t such that t (id)

Synopsis:

by term let id : term such that term ( id )

Pre-condition:

t must be an inductive type,existential and t (id) must be an elimanation priciple for that inductive type.

Action:

it proceeds on t to the elimination of the existential one

New sequence to prove:

It opens one new sequent. The names of the new hypotheses are picked byt (id)