数学公式的英语读法

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1、数学公式的英语读法 来源： 李昱的日志(2012-10-0722:42:07)转载▼这些你都知道吗？以后给老外作报告的时候可千万别再“Theequationislikethis…”,“Thevalueislikethis…”有些公式不好写，能看出来什么意思就行了。1.Logic∃thereexist∀forallp⇒q pimpliesq/ifp,thenqp⇔q pifandonlyifq/pisequivalenttoq/pandqareequivalent2.Setsx∈A xbelongstoA/xi

2、sanelement(oramember)ofAx∉A xdoesnotbelongtoA/xisnotanelement(oramember)ofAA⊂B AiscontainedinB/AisasubsetofBA⊃B AcontainsB/BisasubsetofAA∩B AcapB/AmeetB/AintersectionBA∪B AcupB/AjoinB/AunionBAB AminusB/thediferencebetweenAandBA×B AcrossB/thecartesianproduc

3、tofAandB3.Realnumbersx+1 xplusonex-1 xminusonex±1 xplusorminusonexy xy/xmultipliedbyy(x-y)(x+y) xminusy,xplusy= theequalssignx=5 xequals5/xisequalto5x≠5 x(is)notequalto5x≡y xisequivalentto(oridenticalwith)yx>y xisgreaterthanyx≥y xisgreaterthanorequaltoyxxis

4、lessthanyx≤y xislessthanorequaltoy0zeroislessthanxislessthan10≤x≤1 zeroislessthanorequaltoxislessthanorequalto1

5、x

6、 modx/modulusxx2 xsquared/x(raised)tothepower2x3 xcubedx4 xtothefourth/xtothepower4xn xtothenth/xtothepowernx (−n) xtothe(power)minusnx的平方根(squ

7、are)rootx/thesquarerootofxx的三次根cuberoot(of)xx的四次根fourthroot(of)xx的n次根nthroot(of)x(x+y)2 xplusyallsquaredn! nfactorialx^xhatx¯ xbarx˜ xtildexi xi/xsubscripti/xsuffixi/xsubi∑(i=1~n)ai thesumfromiequalsonetonai /thesumasirunsfrom1tonoftheai4.Linearalgebra‖x‖th

8、enorm(ormodulus)ofxOA→OA/vectorOAOA¯ OA/thelengthofthesegmentOAAT Atranspose/thetransposeofAA−1 Ainverse/theinverseofA5.Functionsf(x) fx/fofx/thefunctionfofxf:S→T afunctionffromStoTx→y xmapstoy/xissent(ormapped)toyf’(x) fprimex/fdashx/the(first)derivativeof

9、fwithrespecttoxf”(x) fdouble-primex/fdouble-dashx/thesecondderivativeoffwithrespecttoxf”’(x) triple-primex/ftriple-dashx/thethirdderivativeoffwithrespecttoxf(4)(x) ffourx/thefourthderivativeoffwithrespecttox∂f/∂x1 thepartial(derivative)offwithrespecttox1∂2f

10、/∂x12 thesecondpartial(derivative)offwithrespecttox1∫0∞ theintegralfromzerotoinfinitylimx→0thelimitasxapproacheszerolimx→0+thelimitasxapproacheszerofromabovelimx→0−thelimitasxapproacheszerofrombelowlog