name: "unifiedId", pid: '94' 'cap': true googletag.pubads().setTargeting("cdo_tc", "resp"); 'cap': true Its invention is often credited to Paul Halmos, who wrote "I invented 'iff,' for 'if and only if'—but I could never believe I was really its first inventor."[15]. { bidder: 'sovrn', params: { tagid: '387232' }}, We use when to refer to the time of a future situation or condition that we are certain of: In informal language, we often use where, when or why to introduce defining relative clauses instead of at which, on which or for which. { bidder: 'onemobile', params: { dcn: '8a969411017171829a5c82bb4deb000b', pos: 'cdo_leftslot_160x600' }}, { bidder: 'openx', params: { unit: '541042770', delDomain: 'idm-d.openx.net' }}, { bidder: 'ix', params: { siteId: '195455', size: [300, 250] }}, var mapping_rightslot2 = googletag.sizeMapping().addSize([746, 0], [[300, 250], [120, 600], [160, 600]]).addSize([0, 0], []).build(); "P if Q", "if Q then P", and Q→P all mean that Q is a proper or improper subset of P. "P if and only if Q" and "Q if and only if P" both mean that the sets P and Q are identical to each other. 'increment': 0.5, As, when and while are conjunctions. 'pa pdd chac-sb tc-bd bw hbr-20 hbss lpt-25' : 'hdn'">. ga('send', 'pageview'); Add when to one of your lists below, or create a new one. { bidder: 'appnexus', params: { placementId: '11654151' }}, var pbHdSlots = [ { bidder: 'appnexus', params: { placementId: '11654152' }}, bids: [{ bidder: 'rubicon', params: { accountId: '17282', siteId: '162036', zoneId: '776156', position: 'atf' }}, { bidder: 'ix', params: { siteId: '195457', size: [320, 100] }}, Definitions by the largest Idiom Dictionary. "Iff." bids: [{ bidder: 'rubicon', params: { accountId: '17282', siteId: '162036', zoneId: '776146', position: 'btf' }}, { bidder: 'criteo', params: { networkId: 7100, publisherSubId: 'cdo_mpuslot' }}, If so and if not can stand for an if-clause which is understood from the context: "According to the weather forecast, it might rain tomorrow." { bidder: 'sovrn', params: { tagid: '346693' }}, The authors of one discrete mathematics textbook suggest:[16] "Should you need to pronounce iff, really hang on to the 'ff' so that people hear the difference from 'if'", implying that "iff" could be pronounced as [ɪfː]. { bidder: 'triplelift', params: { inventoryCode: 'Cambridge_SR' }}, Usage explanations of natural written and spoken English, 0 && stateHdr.searchDesk ? { bidder: 'ix', params: { siteId: '195454', size: [300, 250] }}, { bidder: 'ix', params: { siteId: '195452', size: [336, 280] }}, The result is that the truth of either one of the connected statements requires the truth of the other (i.e. { bidder: 'openx', params: { unit: '539971068', delDomain: 'idm-d.openx.net' }}, { bidder: 'ix', params: { siteId: '195455', size: [300, 50] }}, {code: 'ad_contentslot_1', pubstack: { adUnitName: 'cdo_mpuslot', adUnitPath: '/2863368/mpuslot' }, mediaTypes: { banner: { sizes: [[300, 250], [336, 280]] } }, { bidder: 'ix', params: { siteId: '195451', size: [320, 50] }}, var mapping_rightslot = googletag.sizeMapping().addSize([746, 0], [[300, 250]]).addSize([0, 0], []).build(); This means that the relationship between P and Q, established by P→Q, can be expressed in the following, all equivalent, ways: As an example, take the first example above, which states P→Q, where P is "the fruit in question is an apple" and Q is "Madison will eat the fruit in question". In some uses as, when and while can mean the same, but they can also have slightly different meanings. Technically, definitions are always "if and only if" statements; some texts — such as Kelley's General Topology — follow the strict demands of logic, and use "if and only if" or iff in definitions of new terms. Suppose/supposing you can't find a job? Another term for this logical connective is exclusive nor. { bidder: 'openx', params: { unit: '539971063', delDomain: 'idm-d.openx.net' }}, dfpSlots['rightslot'] = googletag.defineSlot('/2863368/rightslot', [[300, 250]], 'ad_rightslot').defineSizeMapping(mapping_rightslot).setTargeting('sri', '0').setTargeting('vp', 'mid').setTargeting('hp', 'right').setTargeting('ad_group', Adomik.randomAdGroup()).addService(googletag.pubads()); {code: 'ad_rightslot', pubstack: { adUnitName: 'cdo_rightslot', adUnitPath: '/2863368/rightslot' }, mediaTypes: { banner: { sizes: [[300, 250]] } }, [1] This is an example of mathematical jargon (although, as noted above, if is more often used than iff in statements of definition). In logical formulae, logical symbols, such as { bidder: 'triplelift', params: { inventoryCode: 'Cambridge_SR' }}, { bidder: 'openx', params: { unit: '539971080', delDomain: 'idm-d.openx.net' }}, [7], are used instead of these phrases; see § Notation below. { bidder: 'appnexus', params: { placementId: '11654157' }}, { bidder: 'sovrn', params: { tagid: '705055' }}, iasLog("exclusion label : lcp"); bids: [{ bidder: 'rubicon', params: { accountId: '17282', siteId: '162050', zoneId: '776340', position: 'btf' }}, { bidder: 'ix', params: { siteId: '195452', size: [336, 280] }}, The continous form emphasises an action that interrupts or occurs during the progress of another action: We can use when to introduce a single completed event that takes place in the middle of a longer activity or event. type: "cookie", via command \iff.[13]. } { bidder: 'onemobile', params: { dcn: '8a969411017171829a5c82bb4deb000b', pos: 'cdo_topslot_728x90' }}, { bidder: 'appnexus', params: { placementId: '19042093' }}, ga('create', 'UA-31379-3',{cookieDomain:'dictionary.cambridge.org',siteSpeedSampleRate: 10}); { bidder: 'triplelift', params: { inventoryCode: 'Cambridge_Billboard' }}, { bidder: 'pubmatic', params: { publisherId: '158679', adSlot: 'cdo_topslot' }}]}, You have mastered the comma rule with but. { bidder: 'openx', params: { unit: '539971071', delDomain: 'idm-d.openx.net' }}, last but not least phrase. {code: 'ad_contentslot_1', pubstack: { adUnitName: 'cdo_mpuslot', adUnitPath: '/2863368/mpuslot' }, mediaTypes: { banner: { sizes: [[300, 250], [336, 280]] } }, {code: 'ad_rightslot2', pubstack: { adUnitName: 'cdo_rightslot2', adUnitPath: '/2863368/rightslot2' }, mediaTypes: { banner: { sizes: [[300, 250], [120, 600], [160, 600]] } }, {\displaystyle \iff } { bidder: 'triplelift', params: { inventoryCode: 'Cambridge_HDX' }}, Q is as follows:[8][9], It is equivalent to that produced by the XNOR gate, and opposite to that produced by the XOR gate. { bidder: 'openx', params: { unit: '541042770', delDomain: 'idm-d.openx.net' }}, { bidder: 'sovrn', params: { tagid: '448834' }}, { bidder: 'sovrn', params: { tagid: '448839' }}, iasLog("criterion : cdo_pc = dictionary"); priceGranularity: customGranularity, { bidder: 'onemobile', params: { dcn: '8a969411017171829a5c82bb4deb000b', pos: 'cdo_topslot_728x90' }}, Weisstein, Eric W. { bidder: 'ix', params: { siteId: '195452', size: [300, 250] }}, We use since to refer to a particular time in the past until another time or until now: How can you say you don't like something when you've never, Selective participation could be an important source of bias, More than one membrane was used for each sample, Needed to make a high vowel non-back (front), The other is that such a system generalizes locally, Note, though, that these verbs can take the nasal prefix, Exploratory expressions should be seen as another important source of variation, on which reanalysis can work, Uninterpretable features, on the other hand, are erased, Eventually the cluster beam intensity will reach a minimum, We suggested that information structure and heaviness are among the factors determining, Linguistics: question words & expressions, Linguistics: connecting words which express a contrast. }, bids: [{ bidder: 'rubicon', params: { accountId: '17282', siteId: '162036', zoneId: '776146', position: 'btf' }}, { bidder: 'criteo', params: { networkId: 7100, publisherSubId: 'cdo_mpuslot' }}, { bidder: 'sovrn', params: { tagid: '446382' }}, { bidder: 'ix', params: { siteId: '195456', size: [336, 280] }}, googletag.pubads().setTargeting("cdo_ei", "when"); 'cap': true { bidder: 'ix', params: { siteId: '555365', size: [160, 600] }}, Some asexual people do have sex, and some masturbate. { bidder: 'sovrn', params: { tagid: '448838' }}, We use them to introduce subordinate clauses. { bidder: 'triplelift', params: { inventoryCode: 'Cambridge_MidArticle' }}, iasLog("criterion : cdo_ei = when"); expires: 365 { bidder: 'criteo', params: { networkId: 7100, publisherSubId: 'cdo_mpuslot' }},

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