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1、+ plus 加号；正号- minus 减号；负号± plusorminus 正负号× ismultipliedby 乘号÷ isdividedby 除号＝ isequalto 等于号≠ isnotequalto 不等于号≡ isequivalentto 全等于号≌ isequaltoorapproximatelyequalto 等于或约等于号≈ isapproximatelyequalto 约等于号＜ islessthan 小于号＞ ismorethan 大于号 isnotlessthan 不小于号 isnotmorethan 不大于号≤ islessthanore
2、qualto 小于或等于号≥ ismorethanorequalto 大于或等于号% percent 百分之…‰ permill 千分之…∞ infinity 无限大号∝ variesas 与…成比例√ (square)root 平方根∵ since;because 因为∴ hence 所以∷ equals,as(proportion) 等于，成比例∠ angle 角⌒ semicircle 半圆⊙ circle 圆○ circumference 圆周π pi圆周率△ triangle 三角形⊥ perpendicularto 垂直于∪ unionof 并，合集∩ i
3、ntersectionof交，通集∫ theintegralof…的积分∑ (sigma)summationof 总和° degree 度′ minute 分″ second 秒℃ Celsiussystem 摄氏度{ openbrace,opencurly 左花括号} closebrace,closecurly 右花括号( openparenthesis,openparen 左圆括号) closeparenthesis,closeparen 右圆括号()brackets/parentheses 括号[ openbracket左方括号] closebracket右方括
4、号[]squarebrackets 方括号. period,dot 句号，点
5、 verticalbar,verticalvirgule 竖线& ampersand,and,reference,ref 和，引用* asterisk,multiply,star,pointer 星号，乘号，星，指针/ slash,divide,oblique斜线，斜杠，除号// slash-slash,comment双斜线，注释符# pound 井号 backslash,sometimesescape 反斜线转义符，有时表示转义符或续行符~ tilde 波浪符. fullstop
6、 句号, comma 逗号: colon 冒号; semicolon 分号? questionmark 问号! exclamationmark(英式英语)exclamationpoint(美式英语)' apostrophe 撇号- hyphen 连字号--dash破折号... dots/ellipsis 省略号" singlequotationmarks单引号"" doublequotationmarks双引号‖parallel双线号～ swungdash代字号§ section;division分节号→ arrow箭号；参见号1.Logic9thereexists8
7、forallp)qpimpliesq/ifp,thenqp,qpifandonlyifq/pisequivalenttoq/pandqareequivalent2.Setsx2AxbelongstoA/xisanelement(oramember)ofAx=2AxdoesnotbelongtoA/xisnotanelement(oramember)ofAA?BAiscontainedinB/AisasubsetofBA?BAcontainsB/BisasubsetofAABAcapB/AmeetB/AintersectionBA[BAcupB/AjoinB/Auni
8、onBAnBAminusB/thedi?rencebetweenAandBA?BAcrossB/thecartesianproductofAandB3.Realnumbersx+1xplusonex?1xminusonex?1xplusorminusonexyxy/xmultipliedbyy(x?y)(x+y)xminusy,xplusyxyxovery=theequalssignx=5xequals5/xisequalto5x6=5x(is)notequalto51x?yxisequivalentto(oridenticalwith)yx6?yx
