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Type | Label | Description |
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Statement | ||
Definition | df-right 33401* | Define the left options of a surreal. This is the set of surreals that are "closest" on the right to the given surreal. (Contributed by Scott Fenton, 17-Dec-2021.) |
⊢ R = (𝑥 ∈ No ↦ {𝑦 ∈ ( O ‘( bday ‘𝑥)) ∣ ∀𝑧 ∈ No ((𝑥 <s 𝑧 ∧ 𝑧 <s 𝑦) → ( bday ‘𝑦) ∈ ( bday ‘𝑧))}) | ||
Theorem | madeval 33402 | The value of the made by function. (Contributed by Scott Fenton, 17-Dec-2021.) |
⊢ (𝐴 ∈ On → ( M ‘𝐴) = ( |s “ (𝒫 ∪ ( M “ 𝐴) × 𝒫 ∪ ( M “ 𝐴)))) | ||
Theorem | madeval2 33403* | Alternative characterization of the made by function. (Contributed by Scott Fenton, 17-Dec-2021.) |
⊢ (𝐴 ∈ On → ( M ‘𝐴) = {𝑥 ∈ No ∣ ∃𝑎 ∈ 𝒫 ∪ ( M “ 𝐴)∃𝑏 ∈ 𝒫 ∪ ( M “ 𝐴)(𝑎 <<s 𝑏 ∧ (𝑎 |s 𝑏) = 𝑥)}) | ||
Syntax | ctxp 33404 | Declare the syntax for tail Cartesian product. |
class (𝐴 ⊗ 𝐵) | ||
Syntax | cpprod 33405 | Declare the syntax for the parallel product. |
class pprod(𝑅, 𝑆) | ||
Syntax | csset 33406 | Declare the subset relationship class. |
class SSet | ||
Syntax | ctrans 33407 | Declare the transitive set class. |
class Trans | ||
Syntax | cbigcup 33408 | Declare the set union relationship. |
class Bigcup | ||
Syntax | cfix 33409 | Declare the syntax for the fixpoints of a class. |
class Fix 𝐴 | ||
Syntax | climits 33410 | Declare the class of limit ordinals. |
class Limits | ||
Syntax | cfuns 33411 | Declare the syntax for the class of all function. |
class Funs | ||
Syntax | csingle 33412 | Declare the syntax for the singleton function. |
class Singleton | ||
Syntax | csingles 33413 | Declare the syntax for the class of all singletons. |
class Singletons | ||
Syntax | cimage 33414 | Declare the syntax for the image functor. |
class Image𝐴 | ||
Syntax | ccart 33415 | Declare the syntax for the cartesian function. |
class Cart | ||
Syntax | cimg 33416 | Declare the syntax for the image function. |
class Img | ||
Syntax | cdomain 33417 | Declare the syntax for the domain function. |
class Domain | ||
Syntax | crange 33418 | Declare the syntax for the range function. |
class Range | ||
Syntax | capply 33419 | Declare the syntax for the application function. |
class Apply | ||
Syntax | ccup 33420 | Declare the syntax for the cup function. |
class Cup | ||
Syntax | ccap 33421 | Declare the syntax for the cap function. |
class Cap | ||
Syntax | csuccf 33422 | Declare the syntax for the successor function. |
class Succ | ||
Syntax | cfunpart 33423 | Declare the syntax for the functional part functor. |
class Funpart𝐹 | ||
Syntax | cfullfn 33424 | Declare the syntax for the full function functor. |
class FullFun𝐹 | ||
Syntax | crestrict 33425 | Declare the syntax for the restriction function. |
class Restrict | ||
Syntax | cub 33426 | Declare the syntax for the upper bound relationship functor. |
class UB𝑅 | ||
Syntax | clb 33427 | Declare the syntax for the lower bound relationship functor. |
class LB𝑅 | ||
Definition | df-txp 33428 | Define the tail cross of two classes. Membership in this class is defined by txpss3v 33452 and brtxp 33454. (Contributed by Scott Fenton, 31-Mar-2012.) |
⊢ (𝐴 ⊗ 𝐵) = ((◡(1st ↾ (V × V)) ∘ 𝐴) ∩ (◡(2nd ↾ (V × V)) ∘ 𝐵)) | ||
Definition | df-pprod 33429 | Define the parallel product of two classes. Membership in this class is defined by pprodss4v 33458 and brpprod 33459. (Contributed by Scott Fenton, 11-Apr-2014.) |
⊢ pprod(𝐴, 𝐵) = ((𝐴 ∘ (1st ↾ (V × V))) ⊗ (𝐵 ∘ (2nd ↾ (V × V)))) | ||
Definition | df-sset 33430 | Define the subset class. For the value, see brsset 33463. (Contributed by Scott Fenton, 31-Mar-2012.) |
⊢ SSet = ((V × V) ∖ ran ( E ⊗ (V ∖ E ))) | ||
Definition | df-trans 33431 | Define the class of all transitive sets. (Contributed by Scott Fenton, 31-Mar-2012.) |
⊢ Trans = (V ∖ ran (( E ∘ E ) ∖ E )) | ||
Definition | df-bigcup 33432 | Define the Bigcup function, which, per fvbigcup 33476, carries a set to its union. (Contributed by Scott Fenton, 11-Apr-2012.) |
⊢ Bigcup = ((V × V) ∖ ran ((V ⊗ E ) △ (( E ∘ E ) ⊗ V))) | ||
Definition | df-fix 33433 | Define the class of all fixpoints of a relationship. (Contributed by Scott Fenton, 11-Apr-2012.) |
⊢ Fix 𝐴 = dom (𝐴 ∩ I ) | ||
Definition | df-limits 33434 | Define the class of all limit ordinals. (Contributed by Scott Fenton, 11-Apr-2012.) |
⊢ Limits = ((On ∩ Fix Bigcup ) ∖ {∅}) | ||
Definition | df-funs 33435 | Define the class of all functions. See elfuns 33489 for membership. (Contributed by Scott Fenton, 18-Feb-2013.) |
⊢ Funs = (𝒫 (V × V) ∖ Fix ( E ∘ ((1st ⊗ ((V ∖ I ) ∘ 2nd )) ∘ ◡ E ))) | ||
Definition | df-singleton 33436 | Define the singleton function. See brsingle 33491 for its value. (Contributed by Scott Fenton, 4-Apr-2014.) |
⊢ Singleton = ((V × V) ∖ ran ((V ⊗ E ) △ ( I ⊗ V))) | ||
Definition | df-singles 33437 | Define the class of all singletons. See elsingles 33492 for membership. (Contributed by Scott Fenton, 19-Feb-2013.) |
⊢ Singletons = ran Singleton | ||
Definition | df-image 33438 | Define the image functor. This function takes a set 𝐴 to a function 𝑥 ↦ (𝐴 “ 𝑥), providing that the latter exists. See imageval 33504 for the derivation. (Contributed by Scott Fenton, 27-Mar-2014.) |
⊢ Image𝐴 = ((V × V) ∖ ran ((V ⊗ E ) △ (( E ∘ ◡𝐴) ⊗ V))) | ||
Definition | df-cart 33439 | Define the cartesian product function. See brcart 33506 for its value. (Contributed by Scott Fenton, 11-Apr-2014.) |
⊢ Cart = (((V × V) × V) ∖ ran ((V ⊗ E ) △ (pprod( E , E ) ⊗ V))) | ||
Definition | df-img 33440 | Define the image function. See brimg 33511 for its value. (Contributed by Scott Fenton, 12-Apr-2014.) |
⊢ Img = (Image((2nd ∘ 1st ) ↾ (1st ↾ (V × V))) ∘ Cart) | ||
Definition | df-domain 33441 | Define the domain function. See brdomain 33507 for its value. (Contributed by Scott Fenton, 11-Apr-2014.) |
⊢ Domain = Image(1st ↾ (V × V)) | ||
Definition | df-range 33442 | Define the range function. See brrange 33508 for its value. (Contributed by Scott Fenton, 11-Apr-2014.) |
⊢ Range = Image(2nd ↾ (V × V)) | ||
Definition | df-cup 33443 | Define the little cup function. See brcup 33513 for its value. (Contributed by Scott Fenton, 14-Apr-2014.) |
⊢ Cup = (((V × V) × V) ∖ ran ((V ⊗ E ) △ (((◡1st ∘ E ) ∪ (◡2nd ∘ E )) ⊗ V))) | ||
Definition | df-cap 33444 | Define the little cap function. See brcap 33514 for its value. (Contributed by Scott Fenton, 17-Apr-2014.) |
⊢ Cap = (((V × V) × V) ∖ ran ((V ⊗ E ) △ (((◡1st ∘ E ) ∩ (◡2nd ∘ E )) ⊗ V))) | ||
Definition | df-restrict 33445 | Define the restriction function. See brrestrict 33523 for its value. (Contributed by Scott Fenton, 17-Apr-2014.) |
⊢ Restrict = (Cap ∘ (1st ⊗ (Cart ∘ (2nd ⊗ (Range ∘ 1st ))))) | ||
Definition | df-succf 33446 | Define the successor function. See brsuccf 33515 for its value. (Contributed by Scott Fenton, 14-Apr-2014.) |
⊢ Succ = (Cup ∘ ( I ⊗ Singleton)) | ||
Definition | df-apply 33447 | Define the application function. See brapply 33512 for its value. (Contributed by Scott Fenton, 12-Apr-2014.) |
⊢ Apply = (( Bigcup ∘ Bigcup ) ∘ (((V × V) ∖ ran ((V ⊗ E ) △ (( E ↾ Singletons ) ⊗ V))) ∘ ((Singleton ∘ Img) ∘ pprod( I , Singleton)))) | ||
Definition | df-funpart 33448 | Define the functional part of a class 𝐹. This is the maximal part of 𝐹 that is a function. See funpartfun 33517 and funpartfv 33519 for the meaning of this statement. (Contributed by Scott Fenton, 16-Apr-2014.) |
⊢ Funpart𝐹 = (𝐹 ↾ dom ((Image𝐹 ∘ Singleton) ∩ (V × Singletons ))) | ||
Definition | df-fullfun 33449 | Define the full function over 𝐹. This is a function with domain V that always agrees with 𝐹 for its value. (Contributed by Scott Fenton, 17-Apr-2014.) |
⊢ FullFun𝐹 = (Funpart𝐹 ∪ ((V ∖ dom Funpart𝐹) × {∅})) | ||
Definition | df-ub 33450 | Define the upper bound relationship functor. See brub 33528 for value. (Contributed by Scott Fenton, 3-May-2018.) |
⊢ UB𝑅 = ((V × V) ∖ ((V ∖ 𝑅) ∘ ◡ E )) | ||
Definition | df-lb 33451 | Define the lower bound relationship functor. See brlb 33529 for value. (Contributed by Scott Fenton, 3-May-2018.) |
⊢ LB𝑅 = UB◡𝑅 | ||
Theorem | txpss3v 33452 | A tail Cartesian product is a subset of the class of ordered triples. (Contributed by Scott Fenton, 31-Mar-2012.) |
⊢ (𝐴 ⊗ 𝐵) ⊆ (V × (V × V)) | ||
Theorem | txprel 33453 | A tail Cartesian product is a relationship. (Contributed by Scott Fenton, 31-Mar-2012.) |
⊢ Rel (𝐴 ⊗ 𝐵) | ||
Theorem | brtxp 33454 | Characterize a ternary relation over a tail Cartesian product. Together with txpss3v 33452, this completely defines membership in a tail cross. (Contributed by Scott Fenton, 31-Mar-2012.) (Proof shortened by Peter Mazsa, 2-Oct-2022.) |
⊢ 𝑋 ∈ V & ⊢ 𝑌 ∈ V & ⊢ 𝑍 ∈ V ⇒ ⊢ (𝑋(𝐴 ⊗ 𝐵)〈𝑌, 𝑍〉 ↔ (𝑋𝐴𝑌 ∧ 𝑋𝐵𝑍)) | ||
Theorem | brtxp2 33455* | The binary relation over a tail cross when the second argument is not an ordered pair. (Contributed by Scott Fenton, 14-Apr-2014.) (Revised by Mario Carneiro, 3-May-2015.) |
⊢ 𝐴 ∈ V ⇒ ⊢ (𝐴(𝑅 ⊗ 𝑆)𝐵 ↔ ∃𝑥∃𝑦(𝐵 = 〈𝑥, 𝑦〉 ∧ 𝐴𝑅𝑥 ∧ 𝐴𝑆𝑦)) | ||
Theorem | dfpprod2 33456 | Expanded definition of parallel product. (Contributed by Scott Fenton, 3-May-2014.) |
⊢ pprod(𝐴, 𝐵) = ((◡(1st ↾ (V × V)) ∘ (𝐴 ∘ (1st ↾ (V × V)))) ∩ (◡(2nd ↾ (V × V)) ∘ (𝐵 ∘ (2nd ↾ (V × V))))) | ||
Theorem | pprodcnveq 33457 | A converse law for parallel product. (Contributed by Scott Fenton, 3-May-2014.) |
⊢ pprod(𝑅, 𝑆) = ◡pprod(◡𝑅, ◡𝑆) | ||
Theorem | pprodss4v 33458 | The parallel product is a subclass of ((V × V) × (V × V)). (Contributed by Scott Fenton, 11-Apr-2014.) (Revised by Mario Carneiro, 19-Apr-2014.) (Proof shortened by Peter Mazsa, 2-Oct-2022.) |
⊢ pprod(𝐴, 𝐵) ⊆ ((V × V) × (V × V)) | ||
Theorem | brpprod 33459 | Characterize a quaternary relation over a tail Cartesian product. Together with pprodss4v 33458, this completely defines membership in a parallel product. (Contributed by Scott Fenton, 11-Apr-2014.) (Revised by Mario Carneiro, 19-Apr-2014.) |
⊢ 𝑋 ∈ V & ⊢ 𝑌 ∈ V & ⊢ 𝑍 ∈ V & ⊢ 𝑊 ∈ V ⇒ ⊢ (〈𝑋, 𝑌〉pprod(𝐴, 𝐵)〈𝑍, 𝑊〉 ↔ (𝑋𝐴𝑍 ∧ 𝑌𝐵𝑊)) | ||
Theorem | brpprod3a 33460* | Condition for parallel product when the last argument is not an ordered pair. (Contributed by Scott Fenton, 11-Apr-2014.) (Revised by Mario Carneiro, 19-Apr-2014.) |
⊢ 𝑋 ∈ V & ⊢ 𝑌 ∈ V & ⊢ 𝑍 ∈ V ⇒ ⊢ (〈𝑋, 𝑌〉pprod(𝑅, 𝑆)𝑍 ↔ ∃𝑧∃𝑤(𝑍 = 〈𝑧, 𝑤〉 ∧ 𝑋𝑅𝑧 ∧ 𝑌𝑆𝑤)) | ||
Theorem | brpprod3b 33461* | Condition for parallel product when the first argument is not an ordered pair. (Contributed by Scott Fenton, 3-May-2014.) |
⊢ 𝑋 ∈ V & ⊢ 𝑌 ∈ V & ⊢ 𝑍 ∈ V ⇒ ⊢ (𝑋pprod(𝑅, 𝑆)〈𝑌, 𝑍〉 ↔ ∃𝑧∃𝑤(𝑋 = 〈𝑧, 𝑤〉 ∧ 𝑧𝑅𝑌 ∧ 𝑤𝑆𝑍)) | ||
Theorem | relsset 33462 | The subset class is a binary relation. (Contributed by Scott Fenton, 31-Mar-2012.) |
⊢ Rel SSet | ||
Theorem | brsset 33463 | For sets, the SSet binary relation is equivalent to the subset relationship. (Contributed by Scott Fenton, 31-Mar-2012.) |
⊢ 𝐵 ∈ V ⇒ ⊢ (𝐴 SSet 𝐵 ↔ 𝐴 ⊆ 𝐵) | ||
Theorem | idsset 33464 | I is equal to the intersection of SSet and its converse. (Contributed by Scott Fenton, 31-Mar-2012.) |
⊢ I = ( SSet ∩ ◡ SSet ) | ||
Theorem | eltrans 33465 | Membership in the class of all transitive sets. (Contributed by Scott Fenton, 31-Mar-2012.) |
⊢ 𝐴 ∈ V ⇒ ⊢ (𝐴 ∈ Trans ↔ Tr 𝐴) | ||
Theorem | dfon3 33466 | A quantifier-free definition of On. (Contributed by Scott Fenton, 5-Apr-2012.) |
⊢ On = (V ∖ ran (( SSet ∩ ( Trans × V)) ∖ ( I ∪ E ))) | ||
Theorem | dfon4 33467 | Another quantifier-free definition of On. (Contributed by Scott Fenton, 4-May-2014.) |
⊢ On = (V ∖ (( SSet ∖ ( I ∪ E )) “ Trans )) | ||
Theorem | brtxpsd 33468* | Expansion of a common form used in quantifier-free definitions. (Contributed by Scott Fenton, 17-Apr-2014.) (Revised by Mario Carneiro, 19-Apr-2014.) |
⊢ 𝐴 ∈ V & ⊢ 𝐵 ∈ V ⇒ ⊢ (¬ 𝐴ran ((V ⊗ E ) △ (𝑅 ⊗ V))𝐵 ↔ ∀𝑥(𝑥 ∈ 𝐵 ↔ 𝑥𝑅𝐴)) | ||
Theorem | brtxpsd2 33469* | Another common abbreviation for quantifier-free definitions. (Contributed by Scott Fenton, 21-Apr-2014.) |
⊢ 𝐴 ∈ V & ⊢ 𝐵 ∈ V & ⊢ 𝑅 = (𝐶 ∖ ran ((V ⊗ E ) △ (𝑆 ⊗ V))) & ⊢ 𝐴𝐶𝐵 ⇒ ⊢ (𝐴𝑅𝐵 ↔ ∀𝑥(𝑥 ∈ 𝐵 ↔ 𝑥𝑆𝐴)) | ||
Theorem | brtxpsd3 33470* | A third common abbreviation for quantifier-free definitions. (Contributed by Scott Fenton, 3-May-2014.) |
⊢ 𝐴 ∈ V & ⊢ 𝐵 ∈ V & ⊢ 𝑅 = (𝐶 ∖ ran ((V ⊗ E ) △ (𝑆 ⊗ V))) & ⊢ 𝐴𝐶𝐵 & ⊢ (𝑥 ∈ 𝑋 ↔ 𝑥𝑆𝐴) ⇒ ⊢ (𝐴𝑅𝐵 ↔ 𝐵 = 𝑋) | ||
Theorem | relbigcup 33471 | The Bigcup relationship is a relationship. (Contributed by Scott Fenton, 11-Apr-2012.) |
⊢ Rel Bigcup | ||
Theorem | brbigcup 33472 | Binary relation over Bigcup . (Contributed by Scott Fenton, 11-Apr-2012.) |
⊢ 𝐵 ∈ V ⇒ ⊢ (𝐴 Bigcup 𝐵 ↔ ∪ 𝐴 = 𝐵) | ||
Theorem | dfbigcup2 33473 | Bigcup using maps-to notation. (Contributed by Scott Fenton, 16-Apr-2012.) |
⊢ Bigcup = (𝑥 ∈ V ↦ ∪ 𝑥) | ||
Theorem | fobigcup 33474 | Bigcup maps the universe onto itself. (Contributed by Scott Fenton, 16-Apr-2012.) |
⊢ Bigcup :V–onto→V | ||
Theorem | fnbigcup 33475 | Bigcup is a function over the universal class. (Contributed by Scott Fenton, 11-Apr-2012.) |
⊢ Bigcup Fn V | ||
Theorem | fvbigcup 33476 | For sets, Bigcup yields union. (Contributed by Scott Fenton, 11-Apr-2012.) |
⊢ 𝐴 ∈ V ⇒ ⊢ ( Bigcup ‘𝐴) = ∪ 𝐴 | ||
Theorem | elfix 33477 | Membership in the fixpoints of a class. (Contributed by Scott Fenton, 11-Apr-2012.) |
⊢ 𝐴 ∈ V ⇒ ⊢ (𝐴 ∈ Fix 𝑅 ↔ 𝐴𝑅𝐴) | ||
Theorem | elfix2 33478 | Alternative membership in the fixpoint of a class. (Contributed by Scott Fenton, 11-Apr-2012.) |
⊢ Rel 𝑅 ⇒ ⊢ (𝐴 ∈ Fix 𝑅 ↔ 𝐴𝑅𝐴) | ||
Theorem | dffix2 33479 | The fixpoints of a class in terms of its range. (Contributed by Scott Fenton, 16-Apr-2012.) |
⊢ Fix 𝐴 = ran (𝐴 ∩ I ) | ||
Theorem | fixssdm 33480 | The fixpoints of a class are a subset of its domain. (Contributed by Scott Fenton, 16-Apr-2012.) |
⊢ Fix 𝐴 ⊆ dom 𝐴 | ||
Theorem | fixssrn 33481 | The fixpoints of a class are a subset of its range. (Contributed by Scott Fenton, 16-Apr-2012.) |
⊢ Fix 𝐴 ⊆ ran 𝐴 | ||
Theorem | fixcnv 33482 | The fixpoints of a class are the same as those of its converse. (Contributed by Scott Fenton, 16-Apr-2012.) |
⊢ Fix 𝐴 = Fix ◡𝐴 | ||
Theorem | fixun 33483 | The fixpoint operator distributes over union. (Contributed by Scott Fenton, 16-Apr-2012.) |
⊢ Fix (𝐴 ∪ 𝐵) = ( Fix 𝐴 ∪ Fix 𝐵) | ||
Theorem | ellimits 33484 | Membership in the class of all limit ordinals. (Contributed by Scott Fenton, 11-Apr-2012.) |
⊢ 𝐴 ∈ V ⇒ ⊢ (𝐴 ∈ Limits ↔ Lim 𝐴) | ||
Theorem | limitssson 33485 | The class of all limit ordinals is a subclass of the class of all ordinals. (Contributed by Scott Fenton, 11-Apr-2012.) |
⊢ Limits ⊆ On | ||
Theorem | dfom5b 33486 | A quantifier-free definition of ω that does not depend on ax-inf 9085. (Note: label was changed from dfom5 9097 to dfom5b 33486 to prevent naming conflict. NM, 12-Feb-2013.) (Contributed by Scott Fenton, 11-Apr-2012.) |
⊢ ω = (On ∩ ∩ Limits ) | ||
Theorem | sscoid 33487 | A condition for subset and composition with identity. (Contributed by Scott Fenton, 13-Apr-2018.) |
⊢ (𝐴 ⊆ ( I ∘ 𝐵) ↔ (Rel 𝐴 ∧ 𝐴 ⊆ 𝐵)) | ||
Theorem | dffun10 33488 | Another potential definition of functionhood. Based on statements in http://people.math.gatech.edu/~belinfan/research/autoreas/otter/sum/fs/. (Contributed by Scott Fenton, 30-Aug-2017.) |
⊢ (Fun 𝐹 ↔ 𝐹 ⊆ ( I ∘ (V ∖ ((V ∖ I ) ∘ 𝐹)))) | ||
Theorem | elfuns 33489 | Membership in the class of all functions. (Contributed by Scott Fenton, 18-Feb-2013.) |
⊢ 𝐹 ∈ V ⇒ ⊢ (𝐹 ∈ Funs ↔ Fun 𝐹) | ||
Theorem | elfunsg 33490 | Closed form of elfuns 33489. (Contributed by Scott Fenton, 2-May-2014.) |
⊢ (𝐹 ∈ 𝑉 → (𝐹 ∈ Funs ↔ Fun 𝐹)) | ||
Theorem | brsingle 33491 | The binary relation form of the singleton function. (Contributed by Scott Fenton, 4-Apr-2014.) (Revised by Mario Carneiro, 19-Apr-2014.) |
⊢ 𝐴 ∈ V & ⊢ 𝐵 ∈ V ⇒ ⊢ (𝐴Singleton𝐵 ↔ 𝐵 = {𝐴}) | ||
Theorem | elsingles 33492* | Membership in the class of all singletons. (Contributed by Scott Fenton, 19-Feb-2013.) |
⊢ (𝐴 ∈ Singletons ↔ ∃𝑥 𝐴 = {𝑥}) | ||
Theorem | fnsingle 33493 | The singleton relationship is a function over the universe. (Contributed by Scott Fenton, 4-Apr-2014.) (Revised by Mario Carneiro, 19-Apr-2014.) |
⊢ Singleton Fn V | ||
Theorem | fvsingle 33494 | The value of the singleton function. (Contributed by Scott Fenton, 4-Apr-2014.) (Revised by Mario Carneiro, 19-Apr-2014.) (Revised by Scott Fenton, 13-Apr-2018.) |
⊢ (Singleton‘𝐴) = {𝐴} | ||
Theorem | dfsingles2 33495* | Alternate definition of the class of all singletons. (Contributed by Scott Fenton, 20-Nov-2013.) (Revised by Mario Carneiro, 19-Apr-2014.) |
⊢ Singletons = {𝑥 ∣ ∃𝑦 𝑥 = {𝑦}} | ||
Theorem | snelsingles 33496 | A singleton is a member of the class of all singletons. (Contributed by Scott Fenton, 19-Feb-2013.) |
⊢ 𝐴 ∈ V ⇒ ⊢ {𝐴} ∈ Singletons | ||
Theorem | dfiota3 33497 | A definition of iota using minimal quantifiers. (Contributed by Scott Fenton, 19-Feb-2013.) |
⊢ (℩𝑥𝜑) = ∪ ∪ ({{𝑥 ∣ 𝜑}} ∩ Singletons ) | ||
Theorem | dffv5 33498 | Another quantifier-free definition of function value. (Contributed by Scott Fenton, 19-Feb-2013.) |
⊢ (𝐹‘𝐴) = ∪ ∪ ({(𝐹 “ {𝐴})} ∩ Singletons ) | ||
Theorem | unisnif 33499 | Express union of singleton in terms of if. (Contributed by Scott Fenton, 27-Mar-2014.) (Revised by Mario Carneiro, 19-Apr-2014.) |
⊢ ∪ {𝐴} = if(𝐴 ∈ V, 𝐴, ∅) | ||
Theorem | brimage 33500 | Binary relation form of the Image functor. (Contributed by Scott Fenton, 4-Apr-2014.) (Revised by Mario Carneiro, 19-Apr-2014.) |
⊢ 𝐴 ∈ V & ⊢ 𝐵 ∈ V ⇒ ⊢ (𝐴Image𝑅𝐵 ↔ 𝐵 = (𝑅 “ 𝐴)) |
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