Nuprl Lemma : add_cancel_in_lt
∀[a,b,n:ℤ]. a < b supposing a + n < b + n
Proof
Definitions occuring in Statement :
less_than: a < b,
uimplies: b supposing a,
uall: ∀[x:A]. B[x],
add: n + m,
int: ℤ
Definitions unfolded in proof :
uall: ∀[x:A]. B[x],
member: t ∈ T,
uimplies: b supposing a,
prop: ℙ,
all: ∀x:A. B[x],
uiff: uiff(P;Q),
and: P ∧ Q,
subtract: n - m,
top: Top,
nat_plus: ℕ+,
less_than: a < b,
squash: ↓T,
less_than': less_than'(a;b),
true: True,
implies: P ⇒ Q,
le: A ≤ B,
not: ¬A,
false: False,
decidable: Dec(P),
or: P ∨ Q
Lemmas referenced :
decidable__lt,
le-add-cancel-alt,
mul-commutes,
mul-associates,
mul-distributes,
omega-shadow,
add-zero,
minus-add,
less-iff-le,
zero-add,
zero-mul,
mul-distributes-right,
two-mul,
add-mul-special,
add-associates,
add-commutes,
add-swap,
one-mul,
minus-one-mul,
le_reflexive,
subtract_wf,
add_functionality_wrt_le,
not-lt-2,
member-less_than,
less_than_wf
Rules used in proof :
sqequalSubstitution,
sqequalTransitivity,
computationStep,
sqequalReflexivity,
isect_memberFormation,
introduction,
cut,
hypothesis,
lemma_by_obid,
sqequalHypSubstitution,
isectElimination,
thin,
addEquality,
hypothesisEquality,
sqequalRule,
isect_memberEquality,
because_Cache,
independent_isectElimination,
equalityTransitivity,
equalitySymmetry,
intEquality,
dependent_functionElimination,
productElimination,
multiplyEquality,
natural_numberEquality,
voidElimination,
voidEquality,
minusEquality,
dependent_set_memberEquality,
independent_pairFormation,
imageMemberEquality,
baseClosed,
independent_functionElimination,
unionElimination
Latex:
\mforall{}[a,b,n:\mBbbZ{}]. a < b supposing a + n < b + n
Date html generated:
2016_05_13-PM-03_39_43
Last ObjectModification:
2016_01_14-PM-06_38_22
Theory : arithmetic
Home
Index