Cov txheej txheem:
- Yuav ua li cas koj thiaj paub yog tias qhov teeb meem tsis kawg?
- Koj ua pov thawj li cas cardinality ntawm infinite teev?
- Puas suav suav suav tsis txheeb?
- Yuav ua li cas tsis muaj qhov kawg yuav yog Surjective?
Video: Yuav ua li cas qhia ib lub teeb suav suav suav tsis kawg?
2024 Tus sau: Fiona Howard | [email protected]. Kawg hloov kho: 2024-01-10 06:38
Ib txheej suav suav tsis txheeb yog tias nws cov ntsiab lus tuaj yeem muab tso rau hauv ib-rau-ib tsab ntawv nrog cov txheej txheem ntawm tus lejHauv lwm lo lus, ib tus tuaj yeem suav tag nrho cov ntsiab lus hauv lub teeb nyob rau hauv xws li ib txoj kev uas, txawm tias qhov suav yuav siv mus ib txhis, koj yuav tau txais mus rau ib qho tshwj xeeb lub caij nyob rau hauv ib tug finite lub sij hawm.
Yuav ua li cas koj thiaj paub yog tias qhov teeb meem tsis kawg?
Cov ntsiab lus los txheeb xyuas seb lub teeb puas yog qhov kawg lossis tsis kawg yog:
- Ib qho teeb meem tsis kawg yog qhov txwv tsis pub dhau los ntawm qhov pib lossis xaus, tab sis ob sab tuaj yeem ua tau ntev. …
- Yog tias ib lub teeb muaj qhov txwv tsis pub dhau, nws yog qhov tsis kawg thiab yog tias cov ntsiab lus ntawm cov teeb suav suav tau ces nws yog qhov kawg.
Koj ua pov thawj li cas cardinality ntawm infinite teev?
A set A yog suav tsis txheeb yog thiab tsuas yog teem A muaj tib lub cardinality li N (tus lej ntuj). Yog tias teeb A yog suav tsis txheeb, ces |A|=|N|. Tsis tas li ntawd, peb xaiv lub cardinality ntawm countably infinite teev li ℵ0 ("aleph null"). |A|=|N|=ℵ0.
Puas suav suav suav tsis txheeb?
Ib txheej yog hais tias suav tau yog tias nws yog qhov kawg lossis suav tsis kawg. Txij li daim ntawv qhia tus kheej id (x)=x yogib qho kev sib tw ntawm ib qho teeb meem, txhua qhov teeb meem yog equinumerous nrog nws tus kheej, thiab yog li N nws tus kheej yog suav tsis txheeb. Lo lus "countably infinite" yog txhais tau tias yog evocative.
Yuav ua li cas tsis muaj qhov kawg yuav yog Surjective?
Yog B yog infinite, a bijection R B, uas yog li surjective. f yog qhov kev txiav txim.
Pom zoo:
Puas yog algebraic cov lej suav suav tsis kawg?
roots, yog li cov txheej txheem ntawm tag nrho cov hauv paus ntsiab lus ntawm tag nrho cov polynomials nrog cov lej coefficients yog suav nrog kev suav tsis txheeb, yog li ntawm feem ntau suav tau. Nws yog qhov pom tseeb tias qhov teeb tsa tsis yog qhov kawg, yog li cov txheej ntawm txhua tus lej lej suav suav tau .
Yuav ua li cas qhia tau tias cawv yog lub teeb lub cev?
Feem ntau, wines hauv qab 12.5% cawv-los ntawm ntimyog cov cawv txiv hmab, xws li Riesling lossis Prosecco. Wines ntawm 12.5% thiab 13.5% ABV raug suav hais tias yog nruab nrab lub cev. Cov piv txwv zoo ntawm cov cawv nruab nrab suav nrog Sauvignon Blanc, Pinot Grigio, thiab Rose.
Yuav lub chav dej thaum kawg yuav tsis kaw nws tus kheej?
A chav dej thaum kawg yuav tshem tawm nws tus kheej yog tias tej yam qub txeeg qub tegzoo li daim ntawv tso quav tso quav tso rau hauv. Nws yuav siv sij hawm sai npaum li ib teev rau hauv chav dej kom tshem tawm nws tus kheej yog tias cov khoom txhaws nws yooj yim degradable, los yog ntev li ntev li 24 teev yog tias muaj ntau cov organic teeb meem txhaws nws .
Puas kev qhia qhia suav nrog kev qhia?
Yog, nws ua Puas kev qhia ntawv suav nrog kev ua haujlwm? Yog, kev qhia ntawv, txawm tias koj tau ua nws ntiag tug lossis los ntawm lub tuam txhab qhia ntawv yog "ua haujlwm." Yog li koj yog tus nqi kom suav nrog nws hauv koj qhov kev xav tau.
Lub teeb nyem yuav ua li cas thiaj tsis muaj teeb meem?
Lub teeb nyem yog luminous thaum nws tawm lub teeb (tig rau). Nws yog non-luminous thaum nws tawm lossis roj teeb tuag . Puas teeb nyem yog yam khoom luminous? Ib lub cev luminous yog ib yam khoom uas ci los ntawm nws tus kheej lub teeb.
