mmtheorems56 - Metamath Proof Explorer

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Statement List for Metamath Proof Explorer - 5501-5600 - Page 56 of 107

Type	Label	Description
Statement
Theorem	lenltt 5501	'Less than or equal to' expressed in terms of 'less than'.
|- ((A e. RR /\ B e. RR) -> (A <_ B <-> -. B < A))
Theorem	ltnlet 5502	'Less than' expressed in terms of 'less than or equal to'.
|- ((A e. RR /\ B e. RR) -> (A < B <-> -. B <_ A))
Theorem	ltso 5503	'Less than' is a strict ordering. Note: do not shorten this with ltsor 5252, and do not use ltsor 5252 in complex number proofs, in order to maintain a portable derivation of all complex number proofs directly from postulates.
|- < Or RR
Theorem	lttri2t 5504	Consequence of trichotomy.
|- ((A e. RR /\ B e. RR) -> (A =/= B <-> (A < B \/ B < A)))
Theorem	lttri3t 5505	Trichotomy law for 'less than'.
|- ((A e. RR /\ B e. RR) -> (A = B <-> (-. A < B /\ -. B < A)))
Theorem	lttri4t 5506	Trichotomy law for 'less than'.
|- ((A e. RR /\ B e. RR) -> (A < B \/ A = B \/ B < A))
Theorem	ltnet 5507	'Less than' implies not equal.
|- ((A e. RR /\ B e. RR /\ A < B) -> B =/= A)
Theorem	ltnetOLD 5508	'Less than' implies not equal.
|- ((A e. RR /\ B e. RR) -> (A < B -> -. A = B))
Theorem	letri3t 5509	Trichotomy law.
|- ((A e. RR /\ B e. RR) -> (A = B <-> (A <_ B /\ B <_ A)))
Theorem	leloet 5510	'Less than or equal to' expressed in terms of 'less than' or 'equals'.
|- ((A e. RR /\ B e. RR) -> (A <_ B <-> (A < B \/ A = B)))
Theorem	eqleltt 5511	Equality in terms of 'less than or equal to', 'less than'.
|- ((A e. RR /\ B e. RR) -> (A = B <-> (A <_ B /\ -. A < B)))
Theorem	ltlet 5512	'Less than' implies 'less than or equal to'.
|- ((A e. RR /\ B e. RR) -> (A < B -> A <_ B))
Theorem	leltnet 5513	'Less than or equal to' implies 'less than' is not 'equals'.
|- ((A e. RR /\ B e. RR /\ A <_ B) -> (A < B <-> B =/= A))
Theorem	ltlent 5514	'Less than' expressed in terms of 'less than or equal to'.
|- ((A e. RR /\ B e. RR) -> (A < B <-> (A <_ B /\ B =/= A)))
Theorem	lelttrt 5515	Transitive law.
|- ((A e. RR /\ B e. RR /\ C e. RR) -> ((A <_ B /\ B < C) -> A < C))
Theorem	ltletrt 5516	Transitive law.
|- ((A e. RR /\ B e. RR /\ C e. RR) -> ((A < B /\ B <_ C) -> A < C))
Theorem	letrt 5517	Transitive law.
|- ((A e. RR /\ B e. RR /\ C e. RR) -> ((A <_ B /\ B <_ C) -> A <_ C))
Theorem	letrd 5518	Transitive law deduction for 'less than or equal to'.
|- (ph -> A e. RR)   &   |- (ph -> B e. RR)   &   |- (ph -> C e. RR)   &   |- (ph -> A <_ B)   &   |- (ph -> B <_ C)   =>   |- (ph -> A <_ C)
Theorem	lelttrd 5519	Transitive law deduction for 'less than or equal to', 'less than'.
|- (ph -> A e. RR)   &   |- (ph -> B e. RR)   &   |- (ph -> C e. RR)   &   |- (ph -> A <_ B)   &   |- (ph -> B < C)   =>   |- (ph -> A < C)
Theorem	ltletrd 5520	Transitive law deduction for 'less than', 'less than or equal to'.
|- (ph -> A e. RR)   &   |- (ph -> B e. RR)   &   |- (ph -> C e. RR)   &   |- (ph -> A < B)   &   |- (ph -> B <_ C)   =>   |- (ph -> A < C)
Theorem	lttrd 5521	Transitive law deduction for 'less than'.
|- (ph -> A e. RR)   &   |- (ph -> B e. RR)   &   |- (ph -> C e. RR)   &   |- (ph -> A < B)   &   |- (ph -> B < C)   =>   |- (ph -> A < C)
Theorem	ltnrt 5522	'Less than' is irreflexive.
|- (A e. RR -> -. A < A)
Theorem	leidt 5523	'Less than or equal to' is reflexive.
|- (A e. RR -> A <_ A)
Theorem	ltnsymt 5524	'Less than' is not symmetric.
|- ((A e. RR /\ B e. RR) -> (A < B -> -. B < A))
Theorem	ltnsym2t 5525	'Less than' is antisymmetric and irreflexive.
|- ((A e. RR /\ B e. RR) -> -. (A < B /\ B < A))
Theorem	pm2.61ltle 5526	Ordering elimination by cases.
|- ((ph /\ A < B) -> ps)   &   |- ((ph /\ B <_ A) -> ps)   &   |- (ph -> A e. RR)   &   |- (ph -> B e. RR)   =>   |- (ph -> ps)
Ordering on the extended reals
Theorem	elxr 5527	Membership in the set of extended reals.
|- (A e. RR* <-> (A e. RR \/ A = +oo \/ A = -oo))
Theorem	pnfnemnf 5528	Plus and minus infinity are distinguished elements of RR*.
|- +oo =/= -oo
Theorem	renepnft 5529	No (finite) real equals plus infinity.
|- (A e. RR -> A =/= +oo)
Theorem	renemnft 5530	No real equals minus infinity.
|- (A e. RR -> A =/= -oo)
Theorem	renfdisj 5531	The reals and the infinities are disjoint.
|- (RR i^i { +oo, -oo}) = (/)
Theorem	ssxr 5532	The three (non-exclusive) possibilities implied by a subset of extended reals.
|- (A (_ RR* -> (A (_ RR \/ +oo e. A \/ -oo e. A))
Theorem	xrltnrt 5533	The extended real 'less than' is irreflexive.
|- (A e. RR* -> -. A < A)
Theorem	ltpnft 5534	Any (finite) real is less than plus infinity.
|- (A e. RR -> A < +oo)
Theorem	mnfltt 5535	Minus infinity is less than any (finite) real.
|- (A e. RR -> -oo < A)
Theorem	mnfltpnf 5536	Minus infinity is less than plus infinity.
|- -oo < +oo
Theorem	mnfltxrt 5537	Minus infinity is less than an extended real that is either real or plus infinity.
|- ((A e. RR \/ A = +oo) -> -oo < A)
Theorem	pnfnltt 5538	No extended real is greater than plus infinity.
|- (A e. RR* -> -. +oo < A)
Theorem	nltmnft 5539	No extended real is less than minus infinity.
|- (A e. RR* -> -. A < -oo)
Theorem	pnfget 5540	Plus infinity is an upper bound for extended reals.
|- (A e. RR* -> A <_ +oo)
Theorem	mnflet 5541	Minus infinity is less than or equal to any extended real.
|- (A e. RR* -> -oo <_ A)
Theorem	xrltnsymt 5542	Ordering on the extended reals is not symmetric.
|- ((A e. RR* /\ B e. RR*) -> (A < B -> -. B < A))
Theorem	xrltnsym2t 5543	'Less than' is antisymmetric and irreflexive for extended reals.
|- ((A e. RR* /\ B e. RR*) -> -. (A < B /\ B < A))
Theorem	xrlttrit 5544	Ordering on the extended reals satisfies strict trichotomy.
|- ((A e. RR* /\ B e. RR*) -> (A < B <-> -. (A = B \/ B < A)))
Theorem	xrlttrt 5545	Ordering on the extended reals is transitive.
|- ((A e. RR* /\ B e. RR* /\ C e. RR*) -> ((A < B /\ B < C) -> A < C))
Theorem	xrltso 5546	'Less than' is a strict ordering on the extended reals.
|- < Or RR*
Theorem	xrlttri2t 5547	Trichotomy law for 'less than' for extended reals.
|- ((A e. RR* /\ B e. RR*) -> (A =/= B <-> (A < B \/ B < A)))
Theorem	xrlttri3t 5548	Trichotomy law for 'less than' for extended reals.
|- ((A e. RR* /\ B e. RR*) -> (A = B <-> (-. A < B /\ -. B < A)))
Theorem	xrleloet 5549	'Less than or equal' expressed in terms of 'less than' or 'equals', for extended reals.
|- ((A e. RR* /\ B e. RR*) -> (A <_ B <-> (A < B \/ A = B)))
Theorem	xrleltnet 5550	'Less than or equal to' implies 'less than' is not 'equals', for extended reals.
|- ((A e. RR* /\ B e. RR* /\ A <_ B) -> (A < B <-> B =/= A))
Theorem	xrltlet 5551	'Less than' implies 'less than or equal' for extended reals.
|- ((A e. RR* /\ B e. RR*) -> (A < B -> A <_ B))
Theorem	xrleidt 5552	'Less than or equal to' is reflexive for extended reals.
|- (A e. RR* -> A <_ A)
Theorem	xrletrit 5553	Trichotomy law for extended reals.
|- ((A e. RR* /\ B e. RR*) -> (A <_ B \/ B <_ A))
Theorem	xrlelttrt 5554	Transitive law for ordering on extended reals.
|- ((A e. RR* /\ B e. RR* /\ C e. RR*) -> ((A <_ B /\ B < C) -> A < C))
Theorem	xrltletrt 5555	Transitive law for ordering on extended reals.
|- ((A e. RR* /\ B e. RR* /\ C e. RR*) -> ((A < B /\ B <_ C) -> A < C))
Theorem	xrletrt 5556	Transitive law for ordering on extended reals.
|- ((A e. RR* /\ B e. RR* /\ C e. RR*) -> ((A <_ B /\ B <_ C) -> A <_ C))
Theorem	xrltnet 5557	'Less than' implies not equal for extended reals.
|- ((A e. RR* /\ B e. RR* /\ A < B) -> B =/= A)
Theorem	nltpnftt 5558	An extended real is not less than plus infinity iff they are equal.
|- (A e. RR* -> (A = +oo <-> -. A < +oo))
Theorem	ngtmnftt 5559	An extended real is not greater than minus infinity iff they are equal.
|- (A e. RR* -> (A = -oo <-> -. -oo < A))
Theorem	xrrebndt 5560	An extended real is real iff it is strictly bounded by infinities.
|- (A e. RR* -> (A e. RR <-> ( -oo < A /\ A < +oo)))
Theorem	xrret 5561	A way of proving that an extended real is real.
|- (((A e. RR* /\ B e. RR) /\ ( -oo < A /\ A <_ B)) -> A e. RR)
Theorem	xrre2t 5562	An extended real between two others is real.
|- (((A e. RR* /\ B e. RR* /\ C e. RR*) /\ (A < B /\ B < C)) -> B e. RR)
Ordering on reals (cont.)
Theorem	eqlet 5563	Equality implies 'less than or equal to'.
|- ((A e. RR /\ A = B) -> A <_ B)
Theorem	lttri2 5564	Consequence of trichotomy.
|- A e. RR   &   |- B e. RR   =>   |- (A =/= B <-> (A < B \/ B < A))
Theorem	lttri3 5565	Consequence of trichotomy.
|- A e. RR   &   |- B e. RR   =>   |- (A = B <-> (-. A < B /\ -. B < A))
Theorem	letri3 5566	Consequence of trichotomy.
|- A e. RR   &   |- B e. RR   =>   |-