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Type | Label | Description |
---|---|---|
Statement | ||
Theorem | f1f 6101 | A one-to-one mapping is a mapping. (Contributed by NM, 31-Dec-1996.) |
Theorem | f1fn 6102 | A one-to-one mapping is a function on its domain. (Contributed by NM, 8-Mar-2014.) |
Theorem | f1fun 6103 | A one-to-one mapping is a function. (Contributed by NM, 8-Mar-2014.) |
Theorem | f1rel 6104 | A one-to-one onto mapping is a relation. (Contributed by NM, 8-Mar-2014.) |
Theorem | f1dm 6105 | The domain of a one-to-one mapping. (Contributed by NM, 8-Mar-2014.) |
Theorem | f1ss 6106 | A function that is one-to-one is also one-to-one on some superset of its codomain. (Contributed by Mario Carneiro, 12-Jan-2013.) |
Theorem | f1ssr 6107 | A function that is one-to-one is also one-to-one on some superset of its range. (Contributed by Stefan O'Rear, 20-Feb-2015.) |
Theorem | f1ssres 6108 | A function that is one-to-one is also one-to-one on some subset of its domain. (Contributed by Mario Carneiro, 17-Jan-2015.) |
Theorem | f1cnvcnv 6109 | Two ways to express that a set (not necessarily a function) is one-to-one. Each side is equivalent to Definition 6.4(3) of [TakeutiZaring] p. 24, who use the notation "Un2 (A)" for one-to-one. We do not introduce a separate notation since we rarely use it. (Contributed by NM, 13-Aug-2004.) |
Theorem | f1co 6110 | Composition of one-to-one functions. Exercise 30 of [TakeutiZaring] p. 25. (Contributed by NM, 28-May-1998.) |
Theorem | foeq1 6111 | Equality theorem for onto functions. (Contributed by NM, 1-Aug-1994.) |
Theorem | foeq2 6112 | Equality theorem for onto functions. (Contributed by NM, 1-Aug-1994.) |
Theorem | foeq3 6113 | Equality theorem for onto functions. (Contributed by NM, 1-Aug-1994.) |
Theorem | nffo 6114 | Bound-variable hypothesis builder for an onto function. (Contributed by NM, 16-May-2004.) |
Theorem | fof 6115 | An onto mapping is a mapping. (Contributed by NM, 3-Aug-1994.) |
Theorem | fofun 6116 | An onto mapping is a function. (Contributed by NM, 29-Mar-2008.) |
Theorem | fofn 6117 | An onto mapping is a function on its domain. (Contributed by NM, 16-Dec-2008.) |
Theorem | forn 6118 | The codomain of an onto function is its range. (Contributed by NM, 3-Aug-1994.) |
Theorem | dffo2 6119 | Alternate definition of an onto function. (Contributed by NM, 22-Mar-2006.) |
Theorem | foima 6120 | The image of the domain of an onto function. (Contributed by NM, 29-Nov-2002.) |
Theorem | dffn4 6121 | A function maps onto its range. (Contributed by NM, 10-May-1998.) |
Theorem | funforn 6122 | A function maps its domain onto its range. (Contributed by NM, 23-Jul-2004.) |
Theorem | fodmrnu 6123 | An onto function has unique domain and range. (Contributed by NM, 5-Nov-2006.) |
Theorem | fores 6124 | Restriction of an onto function. (Contributed by NM, 4-Mar-1997.) |
Theorem | foco 6125 | Composition of onto functions. (Contributed by NM, 22-Mar-2006.) |
Theorem | foconst 6126 | A nonzero constant function is onto. (Contributed by NM, 12-Jan-2007.) |
Theorem | f1oeq1 6127 | Equality theorem for one-to-one onto functions. (Contributed by NM, 10-Feb-1997.) |
Theorem | f1oeq2 6128 | Equality theorem for one-to-one onto functions. (Contributed by NM, 10-Feb-1997.) |
Theorem | f1oeq3 6129 | Equality theorem for one-to-one onto functions. (Contributed by NM, 10-Feb-1997.) |
Theorem | f1oeq23 6130 | Equality theorem for one-to-one onto functions. (Contributed by FL, 14-Jul-2012.) |
Theorem | f1eq123d 6131 | Equality deduction for one-to-one functions. (Contributed by Mario Carneiro, 27-Jan-2017.) |
Theorem | foeq123d 6132 | Equality deduction for onto functions. (Contributed by Mario Carneiro, 27-Jan-2017.) |
Theorem | f1oeq123d 6133 | Equality deduction for one-to-one onto functions. (Contributed by Mario Carneiro, 27-Jan-2017.) |
Theorem | f1oeq3d 6134 | Equality deduction for one-to-one onto functions. (Contributed by Glauco Siliprandi, 17-Aug-2020.) |
Theorem | nff1o 6135 | Bound-variable hypothesis builder for a one-to-one onto function. (Contributed by NM, 16-May-2004.) |
Theorem | f1of1 6136 | A one-to-one onto mapping is a one-to-one mapping. (Contributed by NM, 12-Dec-2003.) |
Theorem | f1of 6137 | A one-to-one onto mapping is a mapping. (Contributed by NM, 12-Dec-2003.) |
Theorem | f1ofn 6138 | A one-to-one onto mapping is function on its domain. (Contributed by NM, 12-Dec-2003.) |
Theorem | f1ofun 6139 | A one-to-one onto mapping is a function. (Contributed by NM, 12-Dec-2003.) |
Theorem | f1orel 6140 | A one-to-one onto mapping is a relation. (Contributed by NM, 13-Dec-2003.) |
Theorem | f1odm 6141 | The domain of a one-to-one onto mapping. (Contributed by NM, 8-Mar-2014.) |
Theorem | dff1o2 6142 | Alternate definition of one-to-one onto function. (Contributed by NM, 10-Feb-1997.) (Proof shortened by Andrew Salmon, 22-Oct-2011.) |
Theorem | dff1o3 6143 | Alternate definition of one-to-one onto function. (Contributed by NM, 25-Mar-1998.) (Proof shortened by Andrew Salmon, 22-Oct-2011.) |
Theorem | f1ofo 6144 | A one-to-one onto function is an onto function. (Contributed by NM, 28-Apr-2004.) |
Theorem | dff1o4 6145 | Alternate definition of one-to-one onto function. (Contributed by NM, 25-Mar-1998.) (Proof shortened by Andrew Salmon, 22-Oct-2011.) |
Theorem | dff1o5 6146 | Alternate definition of one-to-one onto function. (Contributed by NM, 10-Dec-2003.) (Proof shortened by Andrew Salmon, 22-Oct-2011.) |
Theorem | f1orn 6147 | A one-to-one function maps onto its range. (Contributed by NM, 13-Aug-2004.) |
Theorem | f1f1orn 6148 | A one-to-one function maps one-to-one onto its range. (Contributed by NM, 4-Sep-2004.) |
Theorem | f1ocnv 6149 | The converse of a one-to-one onto function is also one-to-one onto. (Contributed by NM, 11-Feb-1997.) (Proof shortened by Andrew Salmon, 22-Oct-2011.) |
Theorem | f1ocnvb 6150 | A relation is a one-to-one onto function iff its converse is a one-to-one onto function with domain and range interchanged. (Contributed by NM, 8-Dec-2003.) |
Theorem | f1ores 6151 | The restriction of a one-to-one function maps one-to-one onto the image. (Contributed by NM, 25-Mar-1998.) |
Theorem | f1orescnv 6152 | The converse of a one-to-one-onto restricted function. (Contributed by Paul Chapman, 21-Apr-2008.) |
Theorem | f1imacnv 6153 | Preimage of an image. (Contributed by NM, 30-Sep-2004.) |
Theorem | foimacnv 6154 | A reverse version of f1imacnv 6153. (Contributed by Jeff Hankins, 16-Jul-2009.) |
Theorem | foun 6155 | The union of two onto functions with disjoint domains is an onto function. (Contributed by Mario Carneiro, 22-Jun-2016.) |
Theorem | f1oun 6156 | The union of two one-to-one onto functions with disjoint domains and ranges. (Contributed by NM, 26-Mar-1998.) |
Theorem | resdif 6157 | The restriction of a one-to-one onto function to a difference maps onto the difference of the images. (Contributed by Paul Chapman, 11-Apr-2009.) |
Theorem | resin 6158 | The restriction of a one-to-one onto function to an intersection maps onto the intersection of the images. (Contributed by Paul Chapman, 11-Apr-2009.) |
Theorem | f1oco 6159 | Composition of one-to-one onto functions. (Contributed by NM, 19-Mar-1998.) |
Theorem | f1cnv 6160 | The converse of an injective function is bijective. (Contributed by FL, 11-Nov-2011.) |
Theorem | funcocnv2 6161 | Composition with the converse. (Contributed by Jeff Madsen, 2-Sep-2009.) |
Theorem | fococnv2 6162 | The composition of an onto function and its converse. (Contributed by Stefan O'Rear, 12-Feb-2015.) |
Theorem | f1ococnv2 6163 | The composition of a one-to-one onto function and its converse equals the identity relation restricted to the function's range. (Contributed by NM, 13-Dec-2003.) (Proof shortened by Stefan O'Rear, 12-Feb-2015.) |
Theorem | f1cocnv2 6164 | Composition of an injective function with its converse. (Contributed by FL, 11-Nov-2011.) |
Theorem | f1ococnv1 6165 | The composition of a one-to-one onto function's converse and itself equals the identity relation restricted to the function's domain. (Contributed by NM, 13-Dec-2003.) |
Theorem | f1cocnv1 6166 | Composition of an injective function with its converse. (Contributed by FL, 11-Nov-2011.) |
Theorem | funcoeqres 6167 | Re-express a constraint on a composition as a constraint on the composand. (Contributed by Stefan O'Rear, 7-Mar-2015.) |
Theorem | f1ssf1 6168 | A subset of an injective function is injective. (Contributed by AV, 20-Nov-2020.) |
Theorem | f10 6169 | The empty set maps one-to-one into any class. (Contributed by NM, 7-Apr-1998.) |
Theorem | f10d 6170 | The empty set maps one-to-one into any class, deduction version. (Contributed by AV, 25-Nov-2020.) |
Theorem | f1o00 6171 | One-to-one onto mapping of the empty set. (Contributed by NM, 15-Apr-1998.) |
Theorem | fo00 6172 | Onto mapping of the empty set. (Contributed by NM, 22-Mar-2006.) |
Theorem | f1o0 6173 | One-to-one onto mapping of the empty set. (Contributed by NM, 10-Sep-2004.) |
Theorem | f1oi 6174 | A restriction of the identity relation is a one-to-one onto function. (Contributed by NM, 30-Apr-1998.) (Proof shortened by Andrew Salmon, 22-Oct-2011.) |
Theorem | f1ovi 6175 | The identity relation is a one-to-one onto function on the universe. (Contributed by NM, 16-May-2004.) |
Theorem | f1osn 6176 | A singleton of an ordered pair is one-to-one onto function. (Contributed by NM, 18-May-1998.) (Proof shortened by Andrew Salmon, 22-Oct-2011.) |
Theorem | f1osng 6177 | A singleton of an ordered pair is one-to-one onto function. (Contributed by Mario Carneiro, 12-Jan-2013.) |
Theorem | f1sng 6178 | A singleton of an ordered pair is a one-to-one function. (Contributed by AV, 17-Apr-2021.) |
Theorem | fsnd 6179 | A singleton of an ordered pair is a function. (Contributed by AV, 17-Apr-2021.) |
Theorem | f1oprswap 6180 | A two-element swap is a bijection on a pair. (Contributed by Mario Carneiro, 23-Jan-2015.) |
Theorem | f1oprg 6181 | An unordered pair of ordered pairs with different elements is a one-to-one onto function, analogous to f1oprswap 6180. (Contributed by Alexander van der Vekens, 14-Aug-2017.) |
Theorem | tz6.12-2 6182* | Function value when is not a function. Theorem 6.12(2) of [TakeutiZaring] p. 27. (Contributed by NM, 30-Apr-2004.) (Proof shortened by Mario Carneiro, 31-Aug-2015.) |
Theorem | fveu 6183* | The value of a function at a unique point. (Contributed by Scott Fenton, 6-Oct-2017.) |
Theorem | brprcneu 6184* | If is a proper class and is any class, then there is no unique set which is related to through the binary relation . (Contributed by Scott Fenton, 7-Oct-2017.) |
Theorem | fvprc 6185 | A function's value at a proper class is the empty set. (Contributed by NM, 20-May-1998.) |
Theorem | fv2 6186* | Alternate definition of function value. Definition 10.11 of [Quine] p. 68. (Contributed by NM, 30-Apr-2004.) (Proof shortened by Andrew Salmon, 17-Sep-2011.) (Revised by Mario Carneiro, 31-Aug-2015.) |
Theorem | dffv3 6187* | A definition of function value in terms of iota. (Contributed by Scott Fenton, 19-Feb-2013.) |
Theorem | dffv4 6188* | The previous definition of function value, from before the operator was introduced. Although based on the idea embodied by Definition 10.2 of [Quine] p. 65 (see args 5493), this definition apparently does not appear in the literature. (Contributed by NM, 1-Aug-1994.) |
Theorem | elfv 6189* | Membership in a function value. (Contributed by NM, 30-Apr-2004.) |
Theorem | fveq1 6190 | Equality theorem for function value. (Contributed by NM, 29-Dec-1996.) |
Theorem | fveq2 6191 | Equality theorem for function value. (Contributed by NM, 29-Dec-1996.) |
Theorem | fveq1i 6192 | Equality inference for function value. (Contributed by NM, 2-Sep-2003.) |
Theorem | fveq1d 6193 | Equality deduction for function value. (Contributed by NM, 2-Sep-2003.) |
Theorem | fveq2i 6194 | Equality inference for function value. (Contributed by NM, 28-Jul-1999.) |
Theorem | fveq2d 6195 | Equality deduction for function value. (Contributed by NM, 29-May-1999.) |
Theorem | fveq12i 6196 | Equality deduction for function value. (Contributed by FL, 27-Jun-2014.) |
Theorem | fveq12d 6197 | Equality deduction for function value. (Contributed by FL, 22-Dec-2008.) |
Theorem | nffv 6198 | Bound-variable hypothesis builder for function value. (Contributed by NM, 14-Nov-1995.) (Revised by Mario Carneiro, 15-Oct-2016.) |
Theorem | nffvmpt1 6199* | Bound-variable hypothesis builder for mapping, special case. (Contributed by Mario Carneiro, 25-Dec-2016.) |
Theorem | nffvd 6200 | Deduction version of bound-variable hypothesis builder nffv 6198. (Contributed by NM, 10-Nov-2005.) (Revised by Mario Carneiro, 15-Oct-2016.) |
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