Theorem List for Intuitionistic Logic Explorer - 9701-9800 *Has distinct variable
group(s)
Type | Label | Description |
Statement |
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Definition | df-xmul 9701* |
Define multiplication over extended real numbers. (Contributed by Mario
Carneiro, 20-Aug-2015.)
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Theorem | ltxr 9702 |
The 'less than' binary relation on the set of extended reals.
Definition 12-3.1 of [Gleason] p. 173.
(Contributed by NM,
14-Oct-2005.)
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Theorem | elxr 9703 |
Membership in the set of extended reals. (Contributed by NM,
14-Oct-2005.)
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Theorem | xrnemnf 9704 |
An extended real other than minus infinity is real or positive infinite.
(Contributed by Mario Carneiro, 20-Aug-2015.)
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Theorem | xrnepnf 9705 |
An extended real other than plus infinity is real or negative infinite.
(Contributed by Mario Carneiro, 20-Aug-2015.)
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Theorem | xrltnr 9706 |
The extended real 'less than' is irreflexive. (Contributed by NM,
14-Oct-2005.)
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Theorem | ltpnf 9707 |
Any (finite) real is less than plus infinity. (Contributed by NM,
14-Oct-2005.)
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Theorem | ltpnfd 9708 |
Any (finite) real is less than plus infinity. (Contributed by Glauco
Siliprandi, 11-Dec-2019.)
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Theorem | 0ltpnf 9709 |
Zero is less than plus infinity (common case). (Contributed by David A.
Wheeler, 8-Dec-2018.)
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Theorem | mnflt 9710 |
Minus infinity is less than any (finite) real. (Contributed by NM,
14-Oct-2005.)
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Theorem | mnflt0 9711 |
Minus infinity is less than 0 (common case). (Contributed by David A.
Wheeler, 8-Dec-2018.)
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Theorem | mnfltpnf 9712 |
Minus infinity is less than plus infinity. (Contributed by NM,
14-Oct-2005.)
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Theorem | mnfltxr 9713 |
Minus infinity is less than an extended real that is either real or plus
infinity. (Contributed by NM, 2-Feb-2006.)
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Theorem | pnfnlt 9714 |
No extended real is greater than plus infinity. (Contributed by NM,
15-Oct-2005.)
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Theorem | nltmnf 9715 |
No extended real is less than minus infinity. (Contributed by NM,
15-Oct-2005.)
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Theorem | pnfge 9716 |
Plus infinity is an upper bound for extended reals. (Contributed by NM,
30-Jan-2006.)
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Theorem | 0lepnf 9717 |
0 less than or equal to positive infinity. (Contributed by David A.
Wheeler, 8-Dec-2018.)
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Theorem | nn0pnfge0 9718 |
If a number is a nonnegative integer or positive infinity, it is greater
than or equal to 0. (Contributed by Alexander van der Vekens,
6-Jan-2018.)
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Theorem | mnfle 9719 |
Minus infinity is less than or equal to any extended real. (Contributed
by NM, 19-Jan-2006.)
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Theorem | xrltnsym 9720 |
Ordering on the extended reals is not symmetric. (Contributed by NM,
15-Oct-2005.)
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Theorem | xrltnsym2 9721 |
'Less than' is antisymmetric and irreflexive for extended reals.
(Contributed by NM, 6-Feb-2007.)
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Theorem | xrlttr 9722 |
Ordering on the extended reals is transitive. (Contributed by NM,
15-Oct-2005.)
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Theorem | xrltso 9723 |
'Less than' is a weakly linear ordering on the extended reals.
(Contributed by NM, 15-Oct-2005.)
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Theorem | xrlttri3 9724 |
Extended real version of lttri3 7969. (Contributed by NM, 9-Feb-2006.)
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Theorem | xrltle 9725 |
'Less than' implies 'less than or equal' for extended reals. (Contributed
by NM, 19-Jan-2006.)
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Theorem | xrltled 9726 |
'Less than' implies 'less than or equal to' for extended reals.
Deduction form of xrltle 9725. (Contributed by Glauco Siliprandi,
11-Dec-2019.)
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Theorem | xrleid 9727 |
'Less than or equal to' is reflexive for extended reals. (Contributed by
NM, 7-Feb-2007.)
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Theorem | xrleidd 9728 |
'Less than or equal to' is reflexive for extended reals. Deduction form
of xrleid 9727. (Contributed by Glauco Siliprandi,
26-Jun-2021.)
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Theorem | xnn0dcle 9729 |
Decidability of for extended nonnegative integers. (Contributed by
Jim Kingdon, 13-Oct-2024.)
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NN0* NN0* DECID |
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Theorem | xnn0letri 9730 |
Dichotomy for extended nonnegative integers. (Contributed by Jim Kingdon,
13-Oct-2024.)
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NN0* NN0*
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Theorem | xrletri3 9731 |
Trichotomy law for extended reals. (Contributed by FL, 2-Aug-2009.)
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Theorem | xrletrid 9732 |
Trichotomy law for extended reals. (Contributed by Glauco Siliprandi,
17-Aug-2020.)
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Theorem | xrlelttr 9733 |
Transitive law for ordering on extended reals. (Contributed by NM,
19-Jan-2006.)
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Theorem | xrltletr 9734 |
Transitive law for ordering on extended reals. (Contributed by NM,
19-Jan-2006.)
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Theorem | xrletr 9735 |
Transitive law for ordering on extended reals. (Contributed by NM,
9-Feb-2006.)
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Theorem | xrlttrd 9736 |
Transitive law for ordering on extended reals. (Contributed by Mario
Carneiro, 23-Aug-2015.)
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Theorem | xrlelttrd 9737 |
Transitive law for ordering on extended reals. (Contributed by Mario
Carneiro, 23-Aug-2015.)
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Theorem | xrltletrd 9738 |
Transitive law for ordering on extended reals. (Contributed by Mario
Carneiro, 23-Aug-2015.)
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Theorem | xrletrd 9739 |
Transitive law for ordering on extended reals. (Contributed by Mario
Carneiro, 23-Aug-2015.)
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Theorem | xrltne 9740 |
'Less than' implies not equal for extended reals. (Contributed by NM,
20-Jan-2006.)
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Theorem | nltpnft 9741 |
An extended real is not less than plus infinity iff they are equal.
(Contributed by NM, 30-Jan-2006.)
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Theorem | npnflt 9742 |
An extended real is less than plus infinity iff they are not equal.
(Contributed by Jim Kingdon, 17-Apr-2023.)
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Theorem | xgepnf 9743 |
An extended real which is greater than plus infinity is plus infinity.
(Contributed by Thierry Arnoux, 18-Dec-2016.)
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Theorem | ngtmnft 9744 |
An extended real is not greater than minus infinity iff they are equal.
(Contributed by NM, 2-Feb-2006.)
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Theorem | nmnfgt 9745 |
An extended real is greater than minus infinite iff they are not equal.
(Contributed by Jim Kingdon, 17-Apr-2023.)
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Theorem | xrrebnd 9746 |
An extended real is real iff it is strictly bounded by infinities.
(Contributed by NM, 2-Feb-2006.)
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Theorem | xrre 9747 |
A way of proving that an extended real is real. (Contributed by NM,
9-Mar-2006.)
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Theorem | xrre2 9748 |
An extended real between two others is real. (Contributed by NM,
6-Feb-2007.)
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Theorem | xrre3 9749 |
A way of proving that an extended real is real. (Contributed by FL,
29-May-2014.)
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Theorem | ge0gtmnf 9750 |
A nonnegative extended real is greater than negative infinity.
(Contributed by Mario Carneiro, 20-Aug-2015.)
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Theorem | ge0nemnf 9751 |
A nonnegative extended real is greater than negative infinity.
(Contributed by Mario Carneiro, 20-Aug-2015.)
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Theorem | xrrege0 9752 |
A nonnegative extended real that is less than a real bound is real.
(Contributed by Mario Carneiro, 20-Aug-2015.)
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Theorem | z2ge 9753* |
There exists an integer greater than or equal to any two others.
(Contributed by NM, 28-Aug-2005.)
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Theorem | xnegeq 9754 |
Equality of two extended numbers with in front of them.
(Contributed by FL, 26-Dec-2011.) (Proof shortened by Mario Carneiro,
20-Aug-2015.)
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Theorem | xnegpnf 9755 |
Minus . Remark
of [BourbakiTop1] p. IV.15. (Contributed
by FL,
26-Dec-2011.)
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Theorem | xnegmnf 9756 |
Minus . Remark
of [BourbakiTop1] p. IV.15. (Contributed
by FL,
26-Dec-2011.) (Revised by Mario Carneiro, 20-Aug-2015.)
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Theorem | rexneg 9757 |
Minus a real number. Remark [BourbakiTop1] p. IV.15. (Contributed by
FL, 26-Dec-2011.) (Proof shortened by Mario Carneiro, 20-Aug-2015.)
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Theorem | xneg0 9758 |
The negative of zero. (Contributed by Mario Carneiro, 20-Aug-2015.)
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Theorem | xnegcl 9759 |
Closure of extended real negative. (Contributed by Mario Carneiro,
20-Aug-2015.)
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Theorem | xnegneg 9760 |
Extended real version of negneg 8139. (Contributed by Mario Carneiro,
20-Aug-2015.)
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Theorem | xneg11 9761 |
Extended real version of neg11 8140. (Contributed by Mario Carneiro,
20-Aug-2015.)
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Theorem | xltnegi 9762 |
Forward direction of xltneg 9763. (Contributed by Mario Carneiro,
20-Aug-2015.)
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Theorem | xltneg 9763 |
Extended real version of ltneg 8351. (Contributed by Mario Carneiro,
20-Aug-2015.)
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Theorem | xleneg 9764 |
Extended real version of leneg 8354. (Contributed by Mario Carneiro,
20-Aug-2015.)
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Theorem | xlt0neg1 9765 |
Extended real version of lt0neg1 8357. (Contributed by Mario Carneiro,
20-Aug-2015.)
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Theorem | xlt0neg2 9766 |
Extended real version of lt0neg2 8358. (Contributed by Mario Carneiro,
20-Aug-2015.)
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Theorem | xle0neg1 9767 |
Extended real version of le0neg1 8359. (Contributed by Mario Carneiro,
9-Sep-2015.)
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Theorem | xle0neg2 9768 |
Extended real version of le0neg2 8360. (Contributed by Mario Carneiro,
9-Sep-2015.)
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Theorem | xrpnfdc 9769 |
An extended real is or is not plus infinity. (Contributed by Jim Kingdon,
13-Apr-2023.)
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DECID |
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Theorem | xrmnfdc 9770 |
An extended real is or is not minus infinity. (Contributed by Jim
Kingdon, 13-Apr-2023.)
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DECID |
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Theorem | xaddf 9771 |
The extended real addition operation is closed in extended reals.
(Contributed by Mario Carneiro, 21-Aug-2015.)
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Theorem | xaddval 9772 |
Value of the extended real addition operation. (Contributed by Mario
Carneiro, 20-Aug-2015.)
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Theorem | xaddpnf1 9773 |
Addition of positive infinity on the right. (Contributed by Mario
Carneiro, 20-Aug-2015.)
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Theorem | xaddpnf2 9774 |
Addition of positive infinity on the left. (Contributed by Mario
Carneiro, 20-Aug-2015.)
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Theorem | xaddmnf1 9775 |
Addition of negative infinity on the right. (Contributed by Mario
Carneiro, 20-Aug-2015.)
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Theorem | xaddmnf2 9776 |
Addition of negative infinity on the left. (Contributed by Mario
Carneiro, 20-Aug-2015.)
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Theorem | pnfaddmnf 9777 |
Addition of positive and negative infinity. This is often taken to be a
"null" value or out of the domain, but we define it (somewhat
arbitrarily)
to be zero so that the resulting function is total, which simplifies
proofs. (Contributed by Mario Carneiro, 20-Aug-2015.)
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Theorem | mnfaddpnf 9778 |
Addition of negative and positive infinity. This is often taken to be a
"null" value or out of the domain, but we define it (somewhat
arbitrarily)
to be zero so that the resulting function is total, which simplifies
proofs. (Contributed by Mario Carneiro, 20-Aug-2015.)
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Theorem | rexadd 9779 |
The extended real addition operation when both arguments are real.
(Contributed by Mario Carneiro, 20-Aug-2015.)
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Theorem | rexsub 9780 |
Extended real subtraction when both arguments are real. (Contributed by
Mario Carneiro, 23-Aug-2015.)
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Theorem | rexaddd 9781 |
The extended real addition operation when both arguments are real.
Deduction version of rexadd 9779. (Contributed by Glauco Siliprandi,
24-Dec-2020.)
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Theorem | xnegcld 9782 |
Closure of extended real negative. (Contributed by Mario Carneiro,
28-May-2016.)
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Theorem | xrex 9783 |
The set of extended reals exists. (Contributed by NM, 24-Dec-2006.)
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Theorem | xaddnemnf 9784 |
Closure of extended real addition in the subset
.
(Contributed by Mario Carneiro, 20-Aug-2015.)
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Theorem | xaddnepnf 9785 |
Closure of extended real addition in the subset
.
(Contributed by Mario Carneiro, 20-Aug-2015.)
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Theorem | xnegid 9786 |
Extended real version of negid 8136. (Contributed by Mario Carneiro,
20-Aug-2015.)
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Theorem | xaddcl 9787 |
The extended real addition operation is closed in extended reals.
(Contributed by Mario Carneiro, 20-Aug-2015.)
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Theorem | xaddcom 9788 |
The extended real addition operation is commutative. (Contributed by NM,
26-Dec-2011.)
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Theorem | xaddid1 9789 |
Extended real version of addid1 8027. (Contributed by Mario Carneiro,
20-Aug-2015.)
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Theorem | xaddid2 9790 |
Extended real version of addid2 8028. (Contributed by Mario Carneiro,
20-Aug-2015.)
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Theorem | xaddid1d 9791 |
is a right identity for
extended real addition. (Contributed by
Glauco Siliprandi, 17-Aug-2020.)
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Theorem | xnn0lenn0nn0 9792 |
An extended nonnegative integer which is less than or equal to a
nonnegative integer is a nonnegative integer. (Contributed by AV,
24-Nov-2021.)
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NN0* |
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Theorem | xnn0le2is012 9793 |
An extended nonnegative integer which is less than or equal to 2 is either
0 or 1 or 2. (Contributed by AV, 24-Nov-2021.)
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NN0*
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Theorem | xnn0xadd0 9794 |
The sum of two extended nonnegative integers is iff each of the two
extended nonnegative integers is . (Contributed by AV,
14-Dec-2020.)
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NN0* NN0* |
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Theorem | xnegdi 9795 |
Extended real version of negdi 8146. (Contributed by Mario Carneiro,
20-Aug-2015.)
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Theorem | xaddass 9796 |
Associativity of extended real addition. The correct condition here is
"it is not the case that both and appear as one of
,
i.e. ", but this
condition is difficult to work with, so we break the theorem into two
parts: this one, where is not present in , and
xaddass2 9797, where is not present. (Contributed by Mario
Carneiro, 20-Aug-2015.)
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Theorem | xaddass2 9797 |
Associativity of extended real addition. See xaddass 9796 for notes on the
hypotheses. (Contributed by Mario Carneiro, 20-Aug-2015.)
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Theorem | xpncan 9798 |
Extended real version of pncan 8095. (Contributed by Mario Carneiro,
20-Aug-2015.)
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Theorem | xnpcan 9799 |
Extended real version of npcan 8098. (Contributed by Mario Carneiro,
20-Aug-2015.)
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Theorem | xleadd1a 9800 |
Extended real version of leadd1 8319; note that the converse implication is
not true, unlike the real version (for example but
).
(Contributed by Mario Carneiro,
20-Aug-2015.)
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