Nuprl Lemma : absval_neg

[i:{...0}]. (|i| (-i) ∈ ℤ)


Proof




Definitions occuring in Statement :  absval: |i| int_lower: {...i} uall: [x:A]. B[x] minus: -n natural_number: $n int: equal: t ∈ T
Definitions unfolded in proof :  uall: [x:A]. B[x] member: t ∈ T int_lower: {...i} all: x:A. B[x] implies:  Q bool: 𝔹 unit: Unit it: btrue: tt uiff: uiff(P;Q) and: P ∧ Q uimplies: supposing a less_than: a < b less_than': less_than'(a;b) top: Top true: True squash: T not: ¬A false: False prop: bfalse: ff exists: x:A. B[x] or: P ∨ Q sq_type: SQType(T) guard: {T} bnot: ¬bb ifthenelse: if then else fi  assert: b iff: ⇐⇒ Q rev_implies:  Q le: A ≤ B decidable: Dec(P) subtype_rel: A ⊆B subtract: m
Lemmas referenced :  absval_unfold lt_int_wf bool_wf eqtt_to_assert assert_of_lt_int less_than_wf eqff_to_assert equal_wf bool_cases_sqequal subtype_base_sq bool_subtype_base iff_transitivity assert_wf bnot_wf not_wf iff_weakening_uiff assert_of_bnot int_lower_wf int_lower_properties int_subtype_base decidable__int_equal false_wf not-equal-2 less-iff-le add_functionality_wrt_le add-associates add-swap add-zero le-add-cancel condition-implies-le add-commutes minus-add minus-zero
Rules used in proof :  sqequalSubstitution sqequalTransitivity computationStep sqequalReflexivity isect_memberFormation cut sqequalRule introduction extract_by_obid sqequalHypSubstitution isectElimination thin setElimination rename hypothesisEquality hypothesis minusEquality natural_numberEquality because_Cache lambdaFormation unionElimination equalityElimination equalityTransitivity equalitySymmetry productElimination independent_isectElimination lessCases sqequalAxiom isect_memberEquality independent_pairFormation voidElimination voidEquality imageMemberEquality baseClosed imageElimination independent_functionElimination dependent_pairFormation promote_hyp dependent_functionElimination instantiate impliesFunctionality cumulativity intEquality addEquality applyEquality lambdaEquality

Latex:
\mforall{}[i:\{...0\}].  (|i|  =  (-i))



Date html generated: 2017_04_14-AM-07_16_49
Last ObjectModification: 2017_02_27-PM-02_51_38

Theory : arithmetic


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