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Type | Label | Description |
---|---|---|
Statement | ||
Theorem | volss 23301 | The Lebesgue measure is monotone with respect to set inclusion. (Contributed by Thierry Arnoux, 17-Oct-2017.) |
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Theorem | cmmbl 23302 | The complement of a measurable set is measurable. (Contributed by Mario Carneiro, 18-Mar-2014.) |
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Theorem | nulmbl 23303 | A nullset is measurable. (Contributed by Mario Carneiro, 18-Mar-2014.) |
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Theorem | nulmbl2 23304* |
A set of outer measure zero is measurable. The term "outer measure
zero" here is slightly different from "nullset/negligible
set"; a
nullset has ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() |
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Theorem | unmbl 23305 | A union of measurable sets is measurable. (Contributed by Mario Carneiro, 18-Mar-2014.) |
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Theorem | shftmbl 23306* | A shift of a measurable set is measurable. (Contributed by Mario Carneiro, 22-Mar-2014.) |
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Theorem | 0mbl 23307 | The empty set is measurable. (Contributed by Mario Carneiro, 18-Mar-2014.) |
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Theorem | rembl 23308 | The set of all real numbers is measurable. (Contributed by Mario Carneiro, 18-Mar-2014.) |
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Theorem | unidmvol 23309 |
The union of the Lebesgue measurable sets is ![]() |
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Theorem | inmbl 23310 | An intersection of measurable sets is measurable. (Contributed by Mario Carneiro, 18-Mar-2014.) |
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Theorem | difmbl 23311 | A difference of measurable sets is measurable. (Contributed by Mario Carneiro, 18-Mar-2014.) |
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Theorem | finiunmbl 23312* | A finite union of measurable sets is measurable. (Contributed by Mario Carneiro, 20-Mar-2014.) |
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Theorem | volun 23313 | The Lebesgue measure function is finitely additive. (Contributed by Mario Carneiro, 18-Mar-2014.) |
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Theorem | volinun 23314 | Addition of non-disjoint sets. (Contributed by Mario Carneiro, 25-Mar-2015.) |
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Theorem | volfiniun 23315* | The volume of a disjoint finite union of measurable sets is the sum of the measures. (Contributed by Mario Carneiro, 25-Jun-2014.) (Revised by Mario Carneiro, 11-Dec-2016.) |
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Theorem | iundisj 23316* | Rewrite a countable union as a disjoint union. (Contributed by Mario Carneiro, 20-Mar-2014.) |
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Theorem | iundisj2 23317* | A disjoint union is disjoint. (Contributed by Mario Carneiro, 4-Jul-2014.) (Revised by Mario Carneiro, 11-Dec-2016.) |
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Theorem | voliunlem1 23318* | Lemma for voliun 23322. (Contributed by Mario Carneiro, 20-Mar-2014.) |
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Theorem | voliunlem2 23319* | Lemma for voliun 23322. (Contributed by Mario Carneiro, 20-Mar-2014.) |
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Theorem | voliunlem3 23320* | Lemma for voliun 23322. (Contributed by Mario Carneiro, 20-Mar-2014.) |
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Theorem | iunmbl 23321 | The measurable sets are closed under countable union. (Contributed by Mario Carneiro, 18-Mar-2014.) |
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Theorem | voliun 23322 | The Lebesgue measure function is countably additive. (Contributed by Mario Carneiro, 18-Mar-2014.) (Proof shortened by Mario Carneiro, 11-Dec-2016.) |
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Theorem | volsuplem 23323* | Lemma for volsup 23324. (Contributed by Mario Carneiro, 4-Jul-2014.) |
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Theorem | volsup 23324* | The volume of the limit of an increasing sequence of measurable sets is the limit of the volumes. (Contributed by Mario Carneiro, 14-Aug-2014.) (Revised by Mario Carneiro, 11-Dec-2016.) |
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Theorem | iunmbl2 23325* | The measurable sets are closed under countable union. (Contributed by Mario Carneiro, 18-Mar-2014.) |
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Theorem | ioombl1lem1 23326* | Lemma for ioombl1 23330. (Contributed by Mario Carneiro, 18-Aug-2014.) |
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Theorem | ioombl1lem2 23327* | Lemma for ioombl1 23330. (Contributed by Mario Carneiro, 18-Aug-2014.) |
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Theorem | ioombl1lem3 23328* | Lemma for ioombl1 23330. (Contributed by Mario Carneiro, 18-Aug-2014.) |
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Theorem | ioombl1lem4 23329* | Lemma for ioombl1 23330. (Contributed by Mario Carneiro, 16-Jun-2014.) |
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Theorem | ioombl1 23330 | An open right-unbounded interval is measurable. (Contributed by Mario Carneiro, 16-Jun-2014.) (Proof shortened by Mario Carneiro, 25-Mar-2015.) |
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Theorem | icombl1 23331 | A closed unbounded-above interval is measurable. (Contributed by Mario Carneiro, 16-Jun-2014.) |
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Theorem | icombl 23332 | A closed-below, open-above real interval is measurable. (Contributed by Mario Carneiro, 16-Jun-2014.) |
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Theorem | ioombl 23333 | An open real interval is measurable. (Contributed by Mario Carneiro, 16-Jun-2014.) |
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Theorem | iccmbl 23334 | A closed real interval is measurable. (Contributed by Mario Carneiro, 16-Jun-2014.) |
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Theorem | iccvolcl 23335 | A closed real interval has finite volume. (Contributed by Mario Carneiro, 25-Aug-2014.) |
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Theorem | ovolioo 23336 | The measure of an open interval. (Contributed by Mario Carneiro, 2-Sep-2014.) |
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Theorem | volioo 23337 | The measure of an open interval. (Contributed by Glauco Siliprandi, 29-Jun-2017.) |
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Theorem | ioovolcl 23338 | An open real interval has finite volume. (Contributed by Glauco Siliprandi, 29-Jun-2017.) |
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Theorem | ovolfs2 23339 | Alternative expression for the interval length function. (Contributed by Mario Carneiro, 26-Mar-2015.) |
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Theorem | ioorcl2 23340 | An open interval with finite volume has real endpoints. (Contributed by Mario Carneiro, 26-Mar-2015.) |
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Theorem | ioorf 23341 | Define a function from open intervals to their endpoints. (Contributed by Mario Carneiro, 26-Mar-2015.) (Revised by AV, 13-Sep-2020.) |
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Theorem | ioorval 23342* | Define a function from open intervals to their endpoints. (Contributed by Mario Carneiro, 26-Mar-2015.) (Revised by AV, 13-Sep-2020.) |
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Theorem | ioorinv2 23343* |
The function ![]() |
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Theorem | ioorinv 23344* |
The function ![]() |
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Theorem | ioorcl 23345* |
The function ![]() |
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Theorem | uniiccdif 23346 | A union of closed intervals differs from the equivalent union of open intervals by a nullset. (Contributed by Mario Carneiro, 25-Mar-2015.) |
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Theorem | uniioovol 23347* | A disjoint union of open intervals has volume equal to the sum of the volume of the intervals. (This proof does not use countable choice, unlike voliun 23322.) Lemma 565Ca of [Fremlin5] p. 213. (Contributed by Mario Carneiro, 26-Mar-2015.) |
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Theorem | uniiccvol 23348* | An almost-disjoint union of closed intervals (disjoint interiors) has volume equal to the sum of the volume of the intervals. (This proof does not use countable choice, unlike voliun 23322.) (Contributed by Mario Carneiro, 25-Mar-2015.) |
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Theorem | uniioombllem1 23349* | Lemma for uniioombl 23357. (Contributed by Mario Carneiro, 25-Mar-2015.) |
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Theorem | uniioombllem2a 23350* | Lemma for uniioombl 23357. (Contributed by Mario Carneiro, 7-May-2015.) |
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Theorem | uniioombllem2 23351* | Lemma for uniioombl 23357. (Contributed by Mario Carneiro, 26-Mar-2015.) (Revised by Mario Carneiro, 11-Dec-2016.) (Revised by AV, 13-Sep-2020.) |
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Theorem | uniioombllem3a 23352* | Lemma for uniioombl 23357. (Contributed by Mario Carneiro, 8-May-2015.) |
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Theorem | uniioombllem3 23353* | Lemma for uniioombl 23357. (Contributed by Mario Carneiro, 26-Mar-2015.) |
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Theorem | uniioombllem4 23354* | Lemma for uniioombl 23357. (Contributed by Mario Carneiro, 26-Mar-2015.) |
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Theorem | uniioombllem5 23355* | Lemma for uniioombl 23357. (Contributed by Mario Carneiro, 25-Aug-2014.) |
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Theorem | uniioombllem6 23356* | Lemma for uniioombl 23357. (Contributed by Mario Carneiro, 26-Mar-2015.) |
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Theorem | uniioombl 23357* | A disjoint union of open intervals is measurable. (This proof does not use countable choice, unlike iunmbl 23321.) Lemma 565Ca of [Fremlin5] p. 214. (Contributed by Mario Carneiro, 26-Mar-2015.) |
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Theorem | uniiccmbl 23358* | An almost-disjoint union of closed intervals is measurable. (This proof does not use countable choice, unlike iunmbl 23321.) (Contributed by Mario Carneiro, 25-Mar-2015.) |
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Theorem | dyadf 23359* |
The function ![]() |
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Theorem | dyadval 23360* |
Value of the dyadic rational function ![]() |
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Theorem | dyadovol 23361* | Volume of a dyadic rational interval. (Contributed by Mario Carneiro, 26-Mar-2015.) |
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Theorem | dyadss 23362* | Two closed dyadic rational intervals are either in a subset relationship or are almost disjoint (the interiors are disjoint). (Contributed by Mario Carneiro, 26-Mar-2015.) (Proof shortened by Mario Carneiro, 26-Apr-2016.) |
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Theorem | dyaddisjlem 23363* | Lemma for dyaddisj 23364. (Contributed by Mario Carneiro, 26-Mar-2015.) |
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Theorem | dyaddisj 23364* | Two closed dyadic rational intervals are either in a subset relationship or are almost disjoint (the interiors are disjoint). (Contributed by Mario Carneiro, 26-Mar-2015.) |
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Theorem | dyadmaxlem 23365* | Lemma for dyadmax 23366. (Contributed by Mario Carneiro, 26-Mar-2015.) |
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Theorem | dyadmax 23366* | Any nonempty set of dyadic rational intervals has a maximal element. (Contributed by Mario Carneiro, 26-Mar-2015.) |
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Theorem | dyadmbllem 23367* | Lemma for dyadmbl 23368. (Contributed by Mario Carneiro, 26-Mar-2015.) |
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Theorem | dyadmbl 23368* | Any union of dyadic rational intervals is measurable. (Contributed by Mario Carneiro, 26-Mar-2015.) |
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Theorem | opnmbllem 23369* | Lemma for opnmbl 23370. (Contributed by Mario Carneiro, 26-Mar-2015.) |
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Theorem | opnmbl 23370 | All open sets are measurable. This proof, via dyadmbl 23368 and uniioombl 23357, shows that it is possible to avoid choice for measurability of open sets and hence continuous functions, which extends the choice-free consequences of Lebesgue measure considerably farther than would otherwise be possible. (Contributed by Mario Carneiro, 26-Mar-2015.) |
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Theorem | opnmblALT 23371 | All open sets are measurable. This alternative proof of opnmbl 23370 is significantly shorter, at the expense of invoking countable choice ax-cc 9257. (This was also the original proof before the current opnmbl 23370 was discovered.) (Contributed by Mario Carneiro, 17-Jun-2014.) (New usage is discouraged.) (Proof modification is discouraged.) |
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Theorem | subopnmbl 23372 | Sets which are open in a measurable subspace are measurable. (Contributed by Mario Carneiro, 17-Jun-2014.) |
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Theorem | volsup2 23373* |
The volume of ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() |
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Theorem | volcn 23374* | The function formed by restricting a measurable set to a closed interval with a varying endpoint produces an increasing continuous function on the reals. (Contributed by Mario Carneiro, 30-Aug-2014.) |
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Theorem | volivth 23375* |
The Intermediate Value Theorem for the Lebesgue volume function. For
any positive ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() |
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Theorem | vitalilem1 23376* | Lemma for vitali 23382. (Contributed by Mario Carneiro, 16-Jun-2014.) (Proof shortened by AV, 1-May-2021.) |
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Theorem | vitalilem1OLD 23377* | Obsolete proof of vitalilem1 23376 as of 1-May-2021. Lemma for vitali 23382. (Contributed by Mario Carneiro, 16-Jun-2014.) (Proof modification is discouraged.) (New usage is discouraged.) |
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Theorem | vitalilem2 23378* | Lemma for vitali 23382. (Contributed by Mario Carneiro, 16-Jun-2014.) |
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Theorem | vitalilem3 23379* | Lemma for vitali 23382. (Contributed by Mario Carneiro, 16-Jun-2014.) |
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Theorem | vitalilem4 23380* | Lemma for vitali 23382. (Contributed by Mario Carneiro, 16-Jun-2014.) |
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Theorem | vitalilem5 23381* | Lemma for vitali 23382. (Contributed by Mario Carneiro, 16-Jun-2014.) |
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Theorem | vitali 23382 | If the reals can be well-ordered, then there are non-measurable sets. The proof uses "Vitali sets", named for Giuseppe Vitali (1905). (Contributed by Mario Carneiro, 16-Jun-2014.) |
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Syntax | cmbf 23383 | Extend class notation with the class of measurable functions. |
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Syntax | citg1 23384 | Extend class notation with the Lebesgue integral for simple functions. |
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Syntax | citg2 23385 | Extend class notation with the Lebesgue integral for nonnegative functions. |
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Syntax | cibl 23386 | Extend class notation with the class of integrable functions. |
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Syntax | citg 23387 | Extend class notation with the general Lebesgue integral. |
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Definition | df-mbf 23388* | Define the class of measurable functions on the reals. A real function is measurable if the preimage of every open interval is a measurable set (see ismbl 23294) and a complex function is measurable if the real and imaginary parts of the function is measurable. (Contributed by Mario Carneiro, 17-Jun-2014.) |
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Definition | df-itg1 23389* | Define the Lebesgue integral for simple functions. A simple function is a finite linear combination of indicator functions for finitely measurable sets, whose assigned value is the sum of the measures of the sets times their respective weights. (Contributed by Mario Carneiro, 18-Jun-2014.) |
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Definition | df-itg2 23390* |
Define the Lebesgue integral for nonnegative functions. A nonnegative
function's integral is the supremum of the integrals of all simple
functions that are less than the input function. Note that this may be
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Definition | df-ibl 23391* | Define the class of integrable functions on the reals. A function is integrable if it is measurable and the integrals of the pieces of the function are all finite. (Contributed by Mario Carneiro, 28-Jun-2014.) |
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Definition | df-itg 23392* |
Define the full Lebesgue integral, for complex-valued functions to
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Theorem | ismbf1 23393* |
The predicate "![]() |
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Theorem | mbff 23394 | A measurable function is a function into the complex numbers. (Contributed by Mario Carneiro, 17-Jun-2014.) |
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Theorem | mbfdm 23395 | The domain of a measurable function is measurable. (Contributed by Mario Carneiro, 17-Jun-2014.) |
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Theorem | mbfconstlem 23396 | Lemma for mbfconst 23402. (Contributed by Mario Carneiro, 17-Jun-2014.) |
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Theorem | ismbf 23397* |
The predicate "![]() |
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Theorem | ismbfcn 23398 | A complex function is measurable iff the real and imaginary components of the function are measurable. (Contributed by Mario Carneiro, 17-Jun-2014.) |
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Theorem | mbfima 23399 | Definitional property of a measurable function: the preimage of an open right-unbounded interval is measurable. (Contributed by Mario Carneiro, 17-Jun-2014.) |
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Theorem | mbfimaicc 23400 | The preimage of any closed interval under a measurable function is measurable. (Contributed by Mario Carneiro, 18-Jun-2014.) |
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