Nuprl Lemma : arctangent_wf
∀[x:ℝ]. (arctangent(x) ∈ ℝ)
Proof
Definitions occuring in Statement :
arctangent: arctangent(x),
real: ℝ,
uall: ∀[x:A]. B[x],
member: t ∈ T
Definitions unfolded in proof :
all: ∀x:A. B[x],
member: t ∈ T,
uall: ∀[x:A]. B[x],
nat: ℕ,
le: A ≤ B,
and: P ∧ Q,
less_than': less_than'(a;b),
false: False,
not: ¬A,
implies: P ⇒ Q,
prop: ℙ,
uiff: uiff(P;Q),
uimplies: b supposing a,
iff: P ⇐⇒ Q,
rev_implies: P ⇐ Q,
less_than: a < b,
squash: ↓T,
true: True,
rge: x ≥ y,
guard: {T},
arctangent: arctangent(x),
rfun: I ⟶ℝ,
rneq: x ≠ y,
or: P ∨ Q,
ifun: ifun(f;I),
top: Top,
real-fun: real-fun(f;a;b),
rev_uimplies: rev_uimplies(P;Q),
so_lambda: λ2x.t[x],
so_apply: x[s]
Lemmas referenced :
rnexp2-nonneg,
real_wf,
int-to-real_wf,
radd_wf,
rnexp_wf,
false_wf,
le_wf,
trivial-rless-radd,
rless-int,
rless_functionality_wrt_implies,
rleq_weakening_equal,
radd_functionality_wrt_rleq,
rdiv_wf,
rless_wf,
i-member_wf,
rccint_wf,
rmin_wf,
rmax_wf,
left_endpoint_rccint_lemma,
right_endpoint_rccint_lemma,
req_functionality,
rdiv_functionality,
req_weakening,
radd_functionality,
rnexp_functionality,
req_wf,
set_wf,
ifun_wf,
rccint-icompact,
rmin-rleq-rmax,
integral_wf
Rules used in proof :
cut,
sqequalSubstitution,
sqequalTransitivity,
computationStep,
sqequalReflexivity,
lambdaFormation,
introduction,
extract_by_obid,
sqequalHypSubstitution,
dependent_functionElimination,
thin,
hypothesisEquality,
hypothesis,
isectElimination,
natural_numberEquality,
dependent_set_memberEquality,
sqequalRule,
independent_pairFormation,
because_Cache,
productElimination,
independent_isectElimination,
independent_functionElimination,
imageMemberEquality,
baseClosed,
equalityTransitivity,
equalitySymmetry,
isect_memberFormation,
lambdaEquality,
setElimination,
rename,
inrFormation,
setEquality,
isect_memberEquality,
voidElimination,
voidEquality,
axiomEquality
Latex:
\mforall{}[x:\mBbbR{}]. (arctangent(x) \mmember{} \mBbbR{})
Date html generated:
2018_05_22-PM-03_01_53
Last ObjectModification:
2017_10_21-PM-11_18_19
Theory : reals_2
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