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Theorem List for New Foundations Explorer - 601-700   *Has distinct variable group(s)
TypeLabelDescription
Statement
 
Theoremexpl 601 Export a wff from a left conjunct. (Contributed by Jeff Hankins, 28-Aug-2009.)
(((φ ψ) χ) → θ)       (φ → ((ψ χ) → θ))
 
Theoremimpr 602 Import a wff into a right conjunct. (Contributed by Jeff Hankins, 30-Aug-2009.)
((φ ψ) → (χθ))       ((φ (ψ χ)) → θ)
 
Theoremimpl 603 Export a wff from a left conjunct. (Contributed by Mario Carneiro, 9-Jul-2014.)
(φ → ((ψ χ) → θ))       (((φ ψ) χ) → θ)
 
Theoremimpac 604 Importation with conjunction in consequent. (Contributed by NM, 9-Aug-1994.)
(φ → (ψχ))       ((φ ψ) → (χ ψ))
 
Theoremexbiri 605 Inference form of exbir 1365. This proof is exbiriVD (future) automatically translated and minimized. (Contributed by Alan Sare, 31-Dec-2011.) (Proof shortened by Wolf Lammen, 27-Jan-2013.)
((φ ψ) → (χθ))       (φ → (ψ → (θχ)))
 
Theoremsimprbda 606 Deduction eliminating a conjunct. (Contributed by NM, 22-Oct-2007.)
(φ → (ψ ↔ (χ θ)))       ((φ ψ) → χ)
 
Theoremsimplbda 607 Deduction eliminating a conjunct. (Contributed by NM, 22-Oct-2007.)
(φ → (ψ ↔ (χ θ)))       ((φ ψ) → θ)
 
Theoremsimplbi2 608 Deduction eliminating a conjunct. Automatically derived from simplbi2VD (future). (Contributed by Alan Sare, 31-Dec-2011.)
(φ ↔ (ψ χ))       (ψ → (χφ))
 
Theoremdfbi2 609 A theorem similar to the standard definition of the biconditional. Definition of [Margaris] p. 49. (Contributed by NM, 5-Aug-1993.)
((φψ) ↔ ((φψ) (ψφ)))
 
Theoremdfbi 610 Definition df-bi 177 rewritten in an abbreviated form to help intuitive understanding of that definition. Note that it is a conjunction of two implications; one which asserts properties that follow from the biconditional and one which asserts properties that imply the biconditional. (Contributed by NM, 15-Aug-2008.)
(((φψ) → ((φψ) (ψφ))) (((φψ) (ψφ)) → (φψ)))
 
Theorempm4.71 611 Implication in terms of biconditional and conjunction. Theorem *4.71 of [WhiteheadRussell] p. 120. (Contributed by NM, 5-Aug-1993.) (Proof shortened by Wolf Lammen, 2-Dec-2012.)
((φψ) ↔ (φ ↔ (φ ψ)))
 
Theorempm4.71r 612 Implication in terms of biconditional and conjunction. Theorem *4.71 of [WhiteheadRussell] p. 120 (with conjunct reversed). (Contributed by NM, 25-Jul-1999.)
((φψ) ↔ (φ ↔ (ψ φ)))
 
Theorempm4.71i 613 Inference converting an implication to a biconditional with conjunction. Inference from Theorem *4.71 of [WhiteheadRussell] p. 120. (Contributed by NM, 4-Jan-2004.)
(φψ)       (φ ↔ (φ ψ))
 
Theorempm4.71ri 614 Inference converting an implication to a biconditional with conjunction. Inference from Theorem *4.71 of [WhiteheadRussell] p. 120 (with conjunct reversed). (Contributed by NM, 1-Dec-2003.)
(φψ)       (φ ↔ (ψ φ))
 
Theorempm4.71d 615 Deduction converting an implication to a biconditional with conjunction. Deduction from Theorem *4.71 of [WhiteheadRussell] p. 120. (Contributed by Mario Carneiro, 25-Dec-2016.)
(φ → (ψχ))       (φ → (ψ ↔ (ψ χ)))
 
Theorempm4.71rd 616 Deduction converting an implication to a biconditional with conjunction. Deduction from Theorem *4.71 of [WhiteheadRussell] p. 120. (Contributed by NM, 10-Feb-2005.)
(φ → (ψχ))       (φ → (ψ ↔ (χ ψ)))
 
Theorempm5.32 617 Distribution of implication over biconditional. Theorem *5.32 of [WhiteheadRussell] p. 125. (Contributed by NM, 1-Aug-1994.)
((φ → (ψχ)) ↔ ((φ ψ) ↔ (φ χ)))
 
Theorempm5.32i 618 Distribution of implication over biconditional (inference rule). (Contributed by NM, 1-Aug-1994.)
(φ → (ψχ))       ((φ ψ) ↔ (φ χ))
 
Theorempm5.32ri 619 Distribution of implication over biconditional (inference rule). (Contributed by NM, 12-Mar-1995.)
(φ → (ψχ))       ((ψ φ) ↔ (χ φ))
 
Theorempm5.32d 620 Distribution of implication over biconditional (deduction rule). (Contributed by NM, 29-Oct-1996.)
(φ → (ψ → (χθ)))       (φ → ((ψ χ) ↔ (ψ θ)))
 
Theorempm5.32rd 621 Distribution of implication over biconditional (deduction rule). (Contributed by NM, 25-Dec-2004.)
(φ → (ψ → (χθ)))       (φ → ((χ ψ) ↔ (θ ψ)))
 
Theorempm5.32da 622 Distribution of implication over biconditional (deduction rule). (Contributed by NM, 9-Dec-2006.)
((φ ψ) → (χθ))       (φ → ((ψ χ) ↔ (ψ θ)))
 
Theorembiadan2 623 Add a conjunction to an equivalence. (Contributed by Jeff Madsen, 20-Jun-2011.)
(φψ)    &   (ψ → (φχ))       (φ ↔ (ψ χ))
 
Theorempm4.24 624 Theorem *4.24 of [WhiteheadRussell] p. 117. (Contributed by NM, 3-Jan-2005.)
(φ ↔ (φ φ))
 
Theoremanidm 625 Idempotent law for conjunction. (Contributed by NM, 5-Aug-1993.) (Proof shortened by Wolf Lammen, 14-Mar-2014.)
((φ φ) ↔ φ)
 
Theoremanidms 626 Inference from idempotent law for conjunction. (Contributed by NM, 15-Jun-1994.)
((φ φ) → ψ)       (φψ)
 
Theoremanidmdbi 627 Conjunction idempotence with antecedent. (Contributed by Roy F. Longton, 8-Aug-2005.)
((φ → (ψ ψ)) ↔ (φψ))
 
Theoremanasss 628 Associative law for conjunction applied to antecedent (eliminates syllogism). (Contributed by NM, 15-Nov-2002.)
(((φ ψ) χ) → θ)       ((φ (ψ χ)) → θ)
 
Theoremanassrs 629 Associative law for conjunction applied to antecedent (eliminates syllogism). (Contributed by NM, 15-Nov-2002.)
((φ (ψ χ)) → θ)       (((φ ψ) χ) → θ)
 
Theoremanass 630 Associative law for conjunction. Theorem *4.32 of [WhiteheadRussell] p. 118. (Contributed by NM, 5-Aug-1993.) (Proof shortened by Wolf Lammen, 24-Nov-2012.)
(((φ ψ) χ) ↔ (φ (ψ χ)))
 
Theoremsylanl1 631 A syllogism inference. (Contributed by NM, 10-Mar-2005.)
(φψ)    &   (((ψ χ) θ) → τ)       (((φ χ) θ) → τ)
 
Theoremsylanl2 632 A syllogism inference. (Contributed by NM, 1-Jan-2005.)
(φχ)    &   (((ψ χ) θ) → τ)       (((ψ φ) θ) → τ)
 
Theoremsylanr1 633 A syllogism inference. (Contributed by NM, 9-Apr-2005.)
(φχ)    &   ((ψ (χ θ)) → τ)       ((ψ (φ θ)) → τ)
 
Theoremsylanr2 634 A syllogism inference. (Contributed by NM, 9-Apr-2005.)
(φθ)    &   ((ψ (χ θ)) → τ)       ((ψ (χ φ)) → τ)
 
Theoremsylani 635 A syllogism inference. (Contributed by NM, 2-May-1996.)
(φχ)    &   (ψ → ((χ θ) → τ))       (ψ → ((φ θ) → τ))
 
Theoremsylan2i 636 A syllogism inference. (Contributed by NM, 1-Aug-1994.)
(φθ)    &   (ψ → ((χ θ) → τ))       (ψ → ((χ φ) → τ))
 
Theoremsyl2ani 637 A syllogism inference. (Contributed by NM, 3-Aug-1999.)
(φχ)    &   (ηθ)    &   (ψ → ((χ θ) → τ))       (ψ → ((φ η) → τ))
 
Theoremsylan9 638 Nested syllogism inference conjoining dissimilar antecedents. (Contributed by NM, 5-Aug-1993.) (Proof shortened by Andrew Salmon, 7-May-2011.)
(φ → (ψχ))    &   (θ → (χτ))       ((φ θ) → (ψτ))
 
Theoremsylan9r 639 Nested syllogism inference conjoining dissimilar antecedents. (Contributed by NM, 5-Aug-1993.)
(φ → (ψχ))    &   (θ → (χτ))       ((θ φ) → (ψτ))
 
Theoremmtand 640 A modus tollens deduction. (Contributed by Jeff Hankins, 19-Aug-2009.)
(φ → ¬ χ)    &   ((φ ψ) → χ)       (φ → ¬ ψ)
 
Theoremmtord 641 A modus tollens deduction involving disjunction. (Contributed by Jeff Hankins, 15-Jul-2009.)
(φ → ¬ χ)    &   (φ → ¬ θ)    &   (φ → (ψ → (χ θ)))       (φ → ¬ ψ)
 
Theoremsyl2anc 642 Syllogism inference combined with contraction. (Contributed by NM, 16-Mar-2012.)
(φψ)    &   (φχ)    &   ((ψ χ) → θ)       (φθ)
 
Theoremsylancl 643 Syllogism inference combined with modus ponens. (Contributed by Jeff Madsen, 2-Sep-2009.)
(φψ)    &   χ    &   ((ψ χ) → θ)       (φθ)
 
Theoremsylancr 644 Syllogism inference combined with modus ponens. (Contributed by Jeff Madsen, 2-Sep-2009.)
ψ    &   (φχ)    &   ((ψ χ) → θ)       (φθ)
 
Theoremsylanbrc 645 Syllogism inference. (Contributed by Jeff Madsen, 2-Sep-2009.)
(φψ)    &   (φχ)    &   (θ ↔ (ψ χ))       (φθ)
 
Theoremsylancb 646 A syllogism inference combined with contraction. (Contributed by NM, 3-Sep-2004.)
(φψ)    &   (φχ)    &   ((ψ χ) → θ)       (φθ)
 
Theoremsylancbr 647 A syllogism inference combined with contraction. (Contributed by NM, 3-Sep-2004.)
(ψφ)    &   (χφ)    &   ((ψ χ) → θ)       (φθ)
 
Theoremsylancom 648 Syllogism inference with commutation of antecedents. (Contributed by NM, 2-Jul-2008.)
((φ ψ) → χ)    &   ((χ ψ) → θ)       ((φ ψ) → θ)
 
Theoremmpdan 649 An inference based on modus ponens. (Contributed by NM, 23-May-1999.) (Proof shortened by Wolf Lammen, 22-Nov-2012.)
(φψ)    &   ((φ ψ) → χ)       (φχ)
 
Theoremmpancom 650 An inference based on modus ponens with commutation of antecedents. (Contributed by NM, 28-Oct-2003.) (Proof shortened by Wolf Lammen, 7-Apr-2013.)
(ψφ)    &   ((φ ψ) → χ)       (ψχ)
 
Theoremmpan 651 An inference based on modus ponens. (Contributed by NM, 30-Aug-1993.) (Proof shortened by Wolf Lammen, 7-Apr-2013.)
φ    &   ((φ ψ) → χ)       (ψχ)
 
Theoremmpan2 652 An inference based on modus ponens. (Contributed by NM, 16-Sep-1993.) (Proof shortened by Wolf Lammen, 19-Nov-2012.)
ψ    &   ((φ ψ) → χ)       (φχ)
 
Theoremmp2an 653 An inference based on modus ponens. (Contributed by NM, 13-Apr-1995.)
φ    &   ψ    &   ((φ ψ) → χ)       χ
 
Theoremmp4an 654 An inference based on modus ponens. (Contributed by Jeff Madsen, 15-Jun-2010.)
φ    &   ψ    &   χ    &   θ    &   (((φ ψ) (χ θ)) → τ)       τ
 
Theoremmpan2d 655 A deduction based on modus ponens. (Contributed by NM, 12-Dec-2004.)
(φχ)    &   (φ → ((ψ χ) → θ))       (φ → (ψθ))
 
Theoremmpand 656 A deduction based on modus ponens. (Contributed by NM, 12-Dec-2004.) (Proof shortened by Wolf Lammen, 7-Apr-2013.)
(φψ)    &   (φ → ((ψ χ) → θ))       (φ → (χθ))
 
Theoremmpani 657 An inference based on modus ponens. (Contributed by NM, 10-Apr-1994.) (Proof shortened by Wolf Lammen, 19-Nov-2012.)
ψ    &   (φ → ((ψ χ) → θ))       (φ → (χθ))
 
Theoremmpan2i 658 An inference based on modus ponens. (Contributed by NM, 10-Apr-1994.) (Proof shortened by Wolf Lammen, 19-Nov-2012.)
χ    &   (φ → ((ψ χ) → θ))       (φ → (ψθ))
 
Theoremmp2ani 659 An inference based on modus ponens. (Contributed by NM, 12-Dec-2004.)
ψ    &   χ    &   (φ → ((ψ χ) → θ))       (φθ)
 
Theoremmp2and 660 A deduction based on modus ponens. (Contributed by NM, 12-Dec-2004.)
(φψ)    &   (φχ)    &   (φ → ((ψ χ) → θ))       (φθ)
 
Theoremmpanl1 661 An inference based on modus ponens. (Contributed by NM, 16-Aug-1994.) (Proof shortened by Wolf Lammen, 7-Apr-2013.)
φ    &   (((φ ψ) χ) → θ)       ((ψ χ) → θ)
 
Theoremmpanl2 662 An inference based on modus ponens. (Contributed by NM, 16-Aug-1994.) (Proof shortened by Andrew Salmon, 7-May-2011.)
ψ    &   (((φ ψ) χ) → θ)       ((φ χ) → θ)
 
Theoremmpanl12 663 An inference based on modus ponens. (Contributed by NM, 13-Jul-2005.)
φ    &   ψ    &   (((φ ψ) χ) → θ)       (χθ)
 
Theoremmpanr1 664 An inference based on modus ponens. (Contributed by NM, 3-May-1994.) (Proof shortened by Andrew Salmon, 7-May-2011.)
ψ    &   ((φ (ψ χ)) → θ)       ((φ χ) → θ)
 
Theoremmpanr2 665 An inference based on modus ponens. (Contributed by NM, 3-May-1994.) (Proof shortened by Andrew Salmon, 7-May-2011.) (Proof shortened by Wolf Lammen, 7-Apr-2013.)
χ    &   ((φ (ψ χ)) → θ)       ((φ ψ) → θ)
 
Theoremmpanr12 666 An inference based on modus ponens. (Contributed by NM, 24-Jul-2009.)
ψ    &   χ    &   ((φ (ψ χ)) → θ)       (φθ)
 
Theoremmpanlr1 667 An inference based on modus ponens. (Contributed by NM, 30-Dec-2004.) (Proof shortened by Wolf Lammen, 7-Apr-2013.)
ψ    &   (((φ (ψ χ)) θ) → τ)       (((φ χ) θ) → τ)
 
Theorempm5.74da 668 Distribution of implication over biconditional (deduction rule). (Contributed by NM, 4-May-2007.)
((φ ψ) → (χθ))       (φ → ((ψχ) ↔ (ψθ)))
 
Theorempm4.45 669 Theorem *4.45 of [WhiteheadRussell] p. 119. (Contributed by NM, 3-Jan-2005.)
(φ ↔ (φ (φ ψ)))
 
Theoremimdistan 670 Distribution of implication with conjunction. (Contributed by NM, 31-May-1999.) (Proof shortened by Wolf Lammen, 6-Dec-2012.)
((φ → (ψχ)) ↔ ((φ ψ) → (φ χ)))
 
Theoremimdistani 671 Distribution of implication with conjunction. (Contributed by NM, 1-Aug-1994.)
(φ → (ψχ))       ((φ ψ) → (φ χ))
 
Theoremimdistanri 672 Distribution of implication with conjunction. (Contributed by NM, 8-Jan-2002.)
(φ → (ψχ))       ((ψ φ) → (χ φ))
 
Theoremimdistand 673 Distribution of implication with conjunction (deduction rule). (Contributed by NM, 27-Aug-2004.)
(φ → (ψ → (χθ)))       (φ → ((ψ χ) → (ψ θ)))
 
Theoremimdistanda 674 Distribution of implication with conjunction (deduction version with conjoined antecedent). (Contributed by Jeff Madsen, 19-Jun-2011.)
((φ ψ) → (χθ))       (φ → ((ψ χ) → (ψ θ)))
 
Theoremanbi2i 675 Introduce a left conjunct to both sides of a logical equivalence. (Contributed by NM, 5-Aug-1993.) (Proof shortened by Wolf Lammen, 16-Nov-2013.)
(φψ)       ((χ φ) ↔ (χ ψ))
 
Theoremanbi1i 676 Introduce a right conjunct to both sides of a logical equivalence. (Contributed by NM, 5-Aug-1993.) (Proof shortened by Wolf Lammen, 16-Nov-2013.)
(φψ)       ((φ χ) ↔ (ψ χ))
 
Theoremanbi2ci 677 Variant of anbi2i 675 with commutation. (Contributed by Jonathan Ben-Naim, 3-Jun-2011.) (Proof shortened by Andrew Salmon, 14-Jun-2011.)
(φψ)       ((φ χ) ↔ (χ ψ))
 
Theoremanbi12i 678 Conjoin both sides of two equivalences. (Contributed by NM, 5-Aug-1993.)
(φψ)    &   (χθ)       ((φ χ) ↔ (ψ θ))
 
Theoremanbi12ci 679 Variant of anbi12i 678 with commutation. (Contributed by Jonathan Ben-Naim, 3-Jun-2011.)
(φψ)    &   (χθ)       ((φ χ) ↔ (θ ψ))
 
Theoremsylan9bb 680 Nested syllogism inference conjoining dissimilar antecedents. (Contributed by NM, 4-Mar-1995.)
(φ → (ψχ))    &   (θ → (χτ))       ((φ θ) → (ψτ))
 
Theoremsylan9bbr 681 Nested syllogism inference conjoining dissimilar antecedents. (Contributed by NM, 4-Mar-1995.)
(φ → (ψχ))    &   (θ → (χτ))       ((θ φ) → (ψτ))
 
Theoremorbi2d 682 Deduction adding a left disjunct to both sides of a logical equivalence. (Contributed by NM, 5-Aug-1993.)
(φ → (ψχ))       (φ → ((θ ψ) ↔ (θ χ)))
 
Theoremorbi1d 683 Deduction adding a right disjunct to both sides of a logical equivalence. (Contributed by NM, 5-Aug-1993.)
(φ → (ψχ))       (φ → ((ψ θ) ↔ (χ θ)))
 
Theoremanbi2d 684 Deduction adding a left conjunct to both sides of a logical equivalence. (Contributed by NM, 5-Aug-1993.) (Proof shortened by Wolf Lammen, 16-Nov-2013.)
(φ → (ψχ))       (φ → ((θ ψ) ↔ (θ χ)))
 
Theoremanbi1d 685 Deduction adding a right conjunct to both sides of a logical equivalence. (Contributed by NM, 5-Aug-1993.) (Proof shortened by Wolf Lammen, 16-Nov-2013.)
(φ → (ψχ))       (φ → ((ψ θ) ↔ (χ θ)))
 
Theoremorbi1 686 Theorem *4.37 of [WhiteheadRussell] p. 118. (Contributed by NM, 3-Jan-2005.)
((φψ) → ((φ χ) ↔ (ψ χ)))
 
Theoremanbi1 687 Introduce a right conjunct to both sides of a logical equivalence. Theorem *4.36 of [WhiteheadRussell] p. 118. (Contributed by NM, 3-Jan-2005.)
((φψ) → ((φ χ) ↔ (ψ χ)))
 
Theoremanbi2 688 Introduce a left conjunct to both sides of a logical equivalence. (Contributed by NM, 16-Nov-2013.)
((φψ) → ((χ φ) ↔ (χ ψ)))
 
Theorembitr 689 Theorem *4.22 of [WhiteheadRussell] p. 117. (Contributed by NM, 3-Jan-2005.)
(((φψ) (ψχ)) → (φχ))
 
Theoremorbi12d 690 Deduction joining two equivalences to form equivalence of disjunctions. (Contributed by NM, 5-Aug-1993.)
(φ → (ψχ))    &   (φ → (θτ))       (φ → ((ψ θ) ↔ (χ τ)))
 
Theoremanbi12d 691 Deduction joining two equivalences to form equivalence of conjunctions. (Contributed by NM, 5-Aug-1993.)
(φ → (ψχ))    &   (φ → (θτ))       (φ → ((ψ θ) ↔ (χ τ)))
 
Theorempm5.3 692 Theorem *5.3 of [WhiteheadRussell] p. 125. (Contributed by NM, 3-Jan-2005.) (Proof shortened by Andrew Salmon, 7-May-2011.)
(((φ ψ) → χ) ↔ ((φ ψ) → (φ χ)))
 
Theorempm5.61 693 Theorem *5.61 of [WhiteheadRussell] p. 125. (Contributed by NM, 3-Jan-2005.) (Proof shortened by Wolf Lammen, 30-Jun-2013.)
(((φ ψ) ¬ ψ) ↔ (φ ¬ ψ))
 
Theoremadantll 694 Deduction adding a conjunct to antecedent. (Contributed by NM, 4-May-1994.) (Proof shortened by Wolf Lammen, 24-Nov-2012.)
((φ ψ) → χ)       (((θ φ) ψ) → χ)
 
Theoremadantlr 695 Deduction adding a conjunct to antecedent. (Contributed by NM, 4-May-1994.) (Proof shortened by Wolf Lammen, 24-Nov-2012.)
((φ ψ) → χ)       (((φ θ) ψ) → χ)
 
Theoremadantrl 696 Deduction adding a conjunct to antecedent. (Contributed by NM, 4-May-1994.) (Proof shortened by Wolf Lammen, 24-Nov-2012.)
((φ ψ) → χ)       ((φ (θ ψ)) → χ)
 
Theoremadantrr 697 Deduction adding a conjunct to antecedent. (Contributed by NM, 4-May-1994.) (Proof shortened by Wolf Lammen, 24-Nov-2012.)
((φ ψ) → χ)       ((φ (ψ θ)) → χ)
 
Theoremadantlll 698 Deduction adding a conjunct to antecedent. (Contributed by NM, 26-Dec-2004.) (Proof shortened by Wolf Lammen, 2-Dec-2012.)
(((φ ψ) χ) → θ)       ((((τ φ) ψ) χ) → θ)
 
Theoremadantllr 699 Deduction adding a conjunct to antecedent. (Contributed by NM, 26-Dec-2004.) (Proof shortened by Wolf Lammen, 4-Dec-2012.)
(((φ ψ) χ) → θ)       ((((φ τ) ψ) χ) → θ)
 
Theoremadantlrl 700 Deduction adding a conjunct to antecedent. (Contributed by NM, 26-Dec-2004.) (Proof shortened by Wolf Lammen, 4-Dec-2012.)
(((φ ψ) χ) → θ)       (((φ (τ ψ)) χ) → θ)
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