数学符号 数学符号大全
\u6570\u5b66\u7b26\u53f7\u5927\u5168\u6570\u5b66\u7b26\u53f7\u6709\uff1a \u2248 \u2261 \u2260 \uff1d \u2264\u2265 \uff1c \uff1e \u226e \u226f \u2237 \u00b1 \uff0b \uff0d \u00d7 \u00f7 \uff0f \u222b \u222e \u221d \u221e \u2227 \u2228 \u2211 \u220f \u222a \u2229 \u2208 \u2235 \u2234 ≱ \u2016 \u2220 ≲ \u224c \u223d \u221a \uff08\uff09 \u3010\u3011\uff5b\uff5d \u2160 \u2161 \u2295 ≰\u2225\u03b1 \u03b2 \u03b3 \u03b4 \u03b5 \u03b4 \u03b5 \u03b6 \u0393\u3002
\u4e00\u3001\u6570\u5b66\u7b26\u53f7
1\u3001\u6570\u5b66\u7b26\u53f7\u7684\u53d1\u660e\u53ca\u4f7f\u7528\u6bd4\u6570\u5b57\u8981\u665a\uff0c\u4f46\u5176\u6570\u91cf\u5374\u8d85\u8fc7\u4e86\u6570\u5b57\u3002
2\u3001\u73b0\u5728\u5e38\u7528\u7684\u6570\u5b66\u7b26\u53f7\u5df2\u8d85\u8fc7\u4e86200\u4e2a\uff0c\u5176\u4e2d\uff0c\u6bcf\u4e00\u4e2a\u7b26\u53f7\u90fd\u6709\u4e00\u6bb5\u6709\u8da3\u7684\u7ecf\u5386\u3002
\u4e8c\u3001\u8fd0\u7b97\u7b26\u53f7
1\u3001\u5982\u52a0\u53f7\uff08+\uff09\uff0c\u51cf\u53f7\uff08\uff0d\uff09\uff0c\u4e58\u53f7\uff08\u00d7\u6216\u00b7\uff09\uff0c\u9664\u53f7\uff08\u00f7\u6216/\uff09\uff0c\u4e24\u4e2a\u96c6\u5408\u7684\u5e76\u96c6\uff08\u222a\uff09\uff0c\u4ea4\u96c6\uff08\u2229\uff09\uff0c\u6839\u53f7\uff08\u221a\uffe3\uff09\uff0c\u5bf9\u6570\uff08log\uff0clg\uff0cln\uff0clb\uff09\uff0c\u6bd4\uff08:\uff09\uff0c\u7edd\u5bf9\u503c\u7b26\u53f7| |\uff0c\u5fae\u5206\uff08d\uff09\uff0c\u79ef\u5206\uff08\u222b\uff09\uff0c\u95ed\u5408\u66f2\u9762\uff08\u66f2\u7ebf\uff09\u79ef\u5206\uff08\u222e\uff09\u7b49\u3002
\u4e09\u3001\u6027\u8d28\u7b26\u53f7
1\u3001\u5982\u6b63\u53f7\u201c+\u201d\uff0c\u8d1f\u53f7\u201c-\u201d\uff0c\u6b63\u8d1f\u53f7\uff08\u4ee5\u53ca\u4e0e\u4e4b\u5bf9\u5e94\u4f7f\u7528\u7684\u8d1f\u6b63\u53f7\uff09\u3002
\u56db\u3001\u7701\u7565\u7b26\u53f7
1\u3001\u5982\u4e09\u89d2\u5f62\uff08\u25b3\uff09\uff0c\u76f4\u89d2\u4e09\u89d2\u5f62\uff08Rt\u25b3\uff09\uff0c\u6b63\u5f26\uff08sin\uff09\uff08\u89c1\u4e09\u89d2\u51fd\u6570\uff09\u3002
2\u3001\u53cc\u66f2\u6b63\u5f26\u51fd\u6570\uff08sinh\uff09\uff0cx\u7684\u51fd\u6570\uff08f(x)\uff09\uff0c\u6781\u9650\uff08lim\uff09\uff0c\u89d2\uff08\u2220\uff09\u3002
\u6570\u91cf\u7b26\u53f7
\u5982\uff1ai\uff0c2+i\uff0ca\uff0cx\uff0c\u81ea\u7136\u5bf9\u6570\u5e95e\uff0c\u5706\u5468\u7387\u03c0\u3002
\u8fd0\u7b97\u7b26\u53f7
\u5982\u52a0\u53f7\uff08+\uff09\uff0c\u51cf\u53f7\uff08\uff0d\uff09\uff0c\u4e58\u53f7\uff08\u00d7\u6216\u00b7\uff09\uff0c\u9664\u53f7\uff08\u00f7\u6216/\uff09\uff0c\u4e24\u4e2a\u96c6\u5408\u7684\u5e76\u96c6\uff08\u222a\uff09\uff0c\u4ea4\u96c6\uff08\u2229\uff09\uff0c\u6839\u53f7\uff08\u221a\uff09\uff0c\u5bf9\u6570\uff08log\uff0clg\uff0cln\uff09\uff0c\u6bd4\uff08\uff1a\uff09\uff0c\u7edd\u5bf9\u503c\u7b26\u53f7\u201c| |\u201d\uff0c\u5fae\u5206\uff08dx\uff09\uff0c\u79ef\u5206\uff08\u222b\uff09\uff0c\u95ed\u5408\u66f2\u9762\uff08\u66f2\u7ebf\uff09\u79ef\u5206\uff08\u222e\uff09\u7b49\u3002
\u5173\u7cfb\u7b26\u53f7
\u5982\u201c=\u201d\u662f\u7b49\u53f7\uff0c\u201c\u2248\u201d\u662f\u8fd1\u4f3c\u7b26\u53f7\uff0c\u201c\u2260\u201d\u662f\u4e0d\u7b49\u53f7\uff0c\u201c>\u201d\u662f\u5927\u4e8e\u7b26\u53f7\uff0c\u201c<\u201d\u662f\u5c0f\u4e8e\u7b26\u53f7\uff0c\u201c\u2265\u201d\u662f\u5927\u4e8e\u6216\u7b49\u4e8e\u7b26\u53f7\uff08\u4e5f\u53ef\u5199\u4f5c\u201c\u226e\u201d\uff09\uff0c\u201c\u2264\u201d\u662f\u5c0f\u4e8e\u6216\u7b49\u4e8e\u7b26\u53f7\uff08\u4e5f\u53ef\u5199\u4f5c\u201c\u226f\u201d\uff09\uff0c\u3002\u201c\u2192 \u201d\u8868\u793a\u53d8\u91cf\u53d8\u5316\u7684\u8d8b\u52bf\uff0c\u201c\u223d\u201d\u662f\u76f8\u4f3c\u7b26\u53f7\uff0c\u201c\u224c\u201d\u662f\u5168\u7b49\u53f7\uff0c\u201c\u2225\u201d\u662f\u5e73\u884c\u7b26\u53f7\uff0c\u201c\u22a5\u201d\u662f\u5782\u76f4\u7b26\u53f7\uff0c\u201c\u221d\u201d\u662f\u6210\u6b63\u6bd4\u7b26\u53f7\uff0c\uff08\u6ca1\u6709\u6210\u53cd\u6bd4\u7b26\u53f7\uff0c\u4f46\u53ef\u4ee5\u7528\u6210\u6b63\u6bd4\u7b26\u53f7\u914d\u5012\u6570\u5f53\u4f5c\u6210\u53cd\u6bd4\uff09\u201c\u2208\u201d\u662f\u5c5e\u4e8e\u7b26\u53f7\uff0c\u201c⊆\u201d\u662f\u201c\u5305\u542b\u201d\u7b26\u53f7\u7b49\u3002\u201c|\u201d\u8868\u793a\u201c\u80fd\u6574\u9664\u201d\uff08\u4f8b\u5982a|b \u8868\u793a a\u80fd\u6574\u9664b)\uff0cx\u53ef\u4ee5\u4ee3\u8868\u672a\u77e5\u6570\uff0cy\u4e5f\u53ef\u4ee5\u4ee3\u8868\u672a\u77e5\u6570\uff0c\u4efb\u4f55\u5b57\u6bcd\u90fd\u53ef\u4ee5\u4ee3\u8868\u672a\u77e5\u6570\u3002
\u7ed3\u5408\u7b26\u53f7
\u5982\u5c0f\u62ec\u53f7\u201c\uff08\uff09\u201d\u4e2d\u62ec\u53f7\u201c[ ]\u201d\uff0c\u5927\u62ec\u53f7\u201c{ }\u201d\u6a2a\u7ebf\u201c\u2014\u201d\uff0c\u6bd4\u5982\uff082+1\uff09+3=6\uff0c[2.5x\uff0823+2\uff09+1]=x\uff0c{3.5+[3+1]+1=y
\u6027\u8d28\u7b26\u53f7
\u5982\u6b63\u53f7\u201c+\u201d\uff0c\u8d1f\u53f7\u201c\uff0d\u201d\uff0c\u6b63\u8d1f\u53f7\u201c\u00b1\u201d
\u7701\u7565\u7b26\u53f7
\u5982\u4e09\u89d2\u5f62\uff08\u25b3\uff09\uff0c\u76f4\u89d2\u4e09\u89d2\u5f62\uff08Rt\u25b3\uff09\uff0c\u6b63\u5f26\uff08sin\uff09\uff0c\u4f59\u5f26\uff08cos\uff09\uff0cx\u7684\u51fd\u6570\uff08f(x)\uff09\uff0c\u6781\u9650\uff08lim\uff09\uff0c\u89d2\uff08\u2220\uff09\uff0c
\u2235\u56e0\u4e3a\uff0c\uff08\u4e00\u4e2a\u811a\u7ad9\u7740\u7684\uff0c\u7ad9\u4e0d\u4f4f\uff09
\u2234\u6240\u4ee5\uff0c\uff08\u4e24\u4e2a\u811a\u7ad9\u7740\u7684\uff0c\u80fd\u7ad9\u4f4f\uff09 (\u53e3\u8bc0\uff1a\u56e0\u4e3a\u7ad9\u4e0d\u4f4f\uff0c\u6240\u4ee5\u4e24\u4e2a\u70b9)\u603b\u548c\uff08\u2211\uff09\uff0c\u8fde\u4e58\uff08\u220f\uff09\uff0c\u4ecen\u4e2a\u5143\u7d20\u4e2d\u6bcf\u6b21\u53d6\u51far\u4e2a\u5143\u7d20\u6240\u6709\u4e0d\u540c\u7684\u7ec4\u5408\u6570\uff08C(r)(n) \uff09\uff0c\u5e42\uff08A\uff0cAc\uff0cAq\uff0cx^n\uff09\u7b49\u3002
\u6392\u5217\u7ec4\u5408\u7b26\u53f7
C-\u7ec4\u5408\u6570
A-\u6392\u5217\u6570
N-\u5143\u7d20\u7684\u603b\u4e2a\u6570
R-\u53c2\u4e0e\u9009\u62e9\u7684\u5143\u7d20\u4e2a\u6570
!-\u9636\u4e58\uff0c\u59825\uff01=5\u00d74\u00d73\u00d72\u00d71=120
C-Combination- \u7ec4\u5408
A-Arrangement-\u6392\u5217
\u79bb\u6563\u6570\u5b66\u7b26\u53f7\uff08\u672a\u5168\uff09
∀ \u5168\u79f0\u91cf\u8bcd
∃ \u5b58\u5728\u91cf\u8bcd
\u251c \u65ad\u5b9a\u7b26\uff08\u516c\u5f0f\u5728L\u4e2d\u53ef\u8bc1\uff09
\u255e \u6ee1\u8db3\u7b26\uff08\u516c\u5f0f\u5728E\u4e0a\u6709\u6548\uff0c\u516c\u5f0f\u5728E\u4e0a\u53ef\u6ee1\u8db3\uff09
\u2510 \u547d\u9898\u7684\u201c\u975e\u201d\u8fd0\u7b97
\u2227 \u547d\u9898\u7684\u201c\u5408\u53d6\u201d\uff08\u201c\u4e0e\u201d\uff09\u8fd0\u7b97
\u2228 \u547d\u9898\u7684\u201c\u6790\u53d6\u201d\uff08\u201c\u6216\u201d\uff0c\u201c\u53ef\u517c\u6216\u201d\uff09\u8fd0\u7b97
\u2192 \u547d\u9898\u7684\u201c\u6761\u4ef6\u201d\u8fd0\u7b97
↔ \u547d\u9898\u7684\u201c\u53cc\u6761\u4ef6\u201d\u8fd0\u7b97\u7684
AB \u547d\u9898A \u4e0eB \u7b49\u4ef7\u5173\u7cfb
A=>B \u547d\u9898 A\u4e0e B\u7684\u8574\u6db5\u5173\u7cfb
A* \u516c\u5f0fA \u7684\u5bf9\u5076\u516c\u5f0f
wff \u5408\u5f0f\u516c\u5f0f
iff \u5f53\u4e14\u4ec5\u5f53
\u2191 \u547d\u9898\u7684\u201c\u4e0e\u975e\u201d \u8fd0\u7b97\uff08 \u201c\u4e0e\u975e\u95e8\u201d \uff09
\u2193 \u547d\u9898\u7684\u201c\u6216\u975e\u201d\u8fd0\u7b97\uff08 \u201c\u6216\u975e\u95e8\u201d \uff09
\u25a1 \u6a21\u6001\u8bcd\u201c\u5fc5\u7136\u201d
\u25c7 \u6a21\u6001\u8bcd\u201c\u53ef\u80fd\u201d
\u03c6 \u7a7a\u96c6
\u2208 \u5c5e\u4e8e A\u2208B \u5219\u4e3aA\u5c5e\u4e8eB\uff08∉\u4e0d\u5c5e\u4e8e\uff09
P\uff08A\uff09 \u96c6\u5408A\u7684\u5e42\u96c6
|A| \u96c6\u5408A\u7684\u70b9\u6570
R^2=R\u25cbR [R^n=R^(n-1)\u25cbR] \u5173\u7cfbR\u7684\u201c\u590d\u5408\u201d
א \u963f\u5217\u592b
⊆ \u5305\u542b
⊂\uff08\u6216\u4e0b\u9762\u52a0 \u2260\uff09 \u771f\u5305\u542b
\u222a \u96c6\u5408\u7684\u5e76\u8fd0\u7b97
\u2229 \u96c6\u5408\u7684\u4ea4\u8fd0\u7b97
- \uff08\uff5e\uff09 \u96c6\u5408\u7684\u5dee\u8fd0\u7b97
\u3021 \u9650\u5236
[X](\u53f3\u4e0b\u89d2R) \u96c6\u5408\u5173\u4e8e\u5173\u7cfbR\u7684\u7b49\u4ef7\u7c7b
A/ R \u96c6\u5408A\u4e0a\u5173\u4e8eR\u7684\u5546\u96c6
[a] \u5143\u7d20a \u4ea7\u751f\u7684\u5faa\u73af\u7fa4
I (i\u5927\u5199) \u73af\uff0c\u7406\u60f3
Z/(n) \u6a21n\u7684\u540c\u4f59\u7c7b\u96c6\u5408
r(R) \u5173\u7cfb R\u7684\u81ea\u53cd\u95ed\u5305
s(R) \u5173\u7cfb \u7684\u5bf9\u79f0\u95ed\u5305
CP \u547d\u9898\u6f14\u7ece\u7684\u5b9a\u7406\uff08CP \u89c4\u5219\uff09
EG \u5b58\u5728\u63a8\u5e7f\u89c4\u5219\uff08\u5b58\u5728\u91cf\u8bcd\u5f15\u5165\u89c4\u5219\uff09
ES \u5b58\u5728\u91cf\u8bcd\u7279\u6307\u89c4\u5219\uff08\u5b58\u5728\u91cf\u8bcd\u6d88\u53bb\u89c4\u5219\uff09
UG \u5168\u79f0\u63a8\u5e7f\u89c4\u5219\uff08\u5168\u79f0\u91cf\u8bcd\u5f15\u5165\u89c4\u5219\uff09
US \u5168\u79f0\u7279\u6307\u89c4\u5219\uff08\u5168\u79f0\u91cf\u8bcd\u6d88\u53bb\u89c4\u5219\uff09
R \u5173\u7cfb
r \u76f8\u5bb9\u5173\u7cfb
R\u25cbS \u5173\u7cfb \u4e0e\u5173\u7cfb \u7684\u590d\u5408
domf \u51fd\u6570 \u7684\u5b9a\u4e49\u57df\uff08\u524d\u57df\uff09
ranf \u51fd\u6570 \u7684\u503c\u57df
f:X\u2192Y f\u662fX\u5230Y\u7684\u51fd\u6570
GCD(x,y) x,y\u6700\u5927\u516c\u7ea6\u6570
LCM(x,y) x,y\u6700\u5c0f\u516c\u500d\u6570
aH(Ha) H \u5173\u4e8ea\u7684\u5de6\uff08\u53f3\uff09\u966a\u96c6
Ker(f) \u540c\u6001\u6620\u5c04f\u7684\u6838\uff08\u6216\u79f0 f\u540c\u6001\u6838\uff09
[1\uff0cn] 1\u5230n\u7684\u6574\u6570\u96c6\u5408
d(u,v) \u70b9u\u4e0e\u70b9v\u95f4\u7684\u8ddd\u79bb
d(v) \u70b9v\u7684\u5ea6\u6570
G=(V,E) \u70b9\u96c6\u4e3aV\uff0c\u8fb9\u96c6\u4e3aE\u7684\u56fe
W(G) \u56feG\u7684\u8fde\u901a\u5206\u652f\u6570
k(G) \u56feG\u7684\u70b9\u8fde\u901a\u5ea6
\u25b3\uff08G) \u56feG\u7684\u6700\u5927\u70b9\u5ea6
A(G) \u56feG\u7684\u90bb\u63a5\u77e9\u9635
P(G) \u56feG\u7684\u53ef\u8fbe\u77e9\u9635
M(G) \u56feG\u7684\u5173\u8054\u77e9\u9635
C \u590d\u6570\u96c6
N \u81ea\u7136\u6570\u96c6\uff08\u5305\u542b0\u5728\u5185\uff09
N* \u6b63\u81ea\u7136\u6570\u96c6
P \u7d20\u6570\u96c6
Q \u6709\u7406\u6570\u96c6
R \u5b9e\u6570\u96c6
Z \u6574\u6570\u96c6
Set \u96c6\u8303\u7574
Top \u62d3\u6251\u7a7a\u95f4\u8303\u7574
Ab \u4ea4\u6362\u7fa4\u8303\u7574
Grp \u7fa4\u8303\u7574
Mon \u5355\u5143\u534a\u7fa4\u8303\u7574
Ring \u6709\u5355\u4f4d\u5143\u7684\uff08\u7ed3\u5408\uff09\u73af\u8303\u7574
Rng \u73af\u8303\u7574
CRng \u4ea4\u6362\u73af\u8303\u7574
R-mod \u73afR\u7684\u5de6\u6a21\u8303\u7574
mod-R \u73afR\u7684\u53f3\u6a21\u8303\u7574
Field \u57df\u8303\u7574
Poset \u504f\u5e8f\u96c6\u8303\u7574
\u90e8\u5206\u5e0c\u814a\u5b57\u6bcd\u6570\u5b66\u7b26\u53f7
\u5b57\u6bcd \u53e4\u5e0c\u814a\u8bed\u540d\u79f0 \u82f1\u8bed\u540d\u79f0 \u53e4\u5e0c\u814a\u8bed\u53d1\u97f3 \u73b0\u4ee3\u5e0c\u814a\u8bed\u53d1\u97f3 \u4e2d\u6587\u6ce8\u97f3 \u6570\u5b66\u610f\u601d
\u0391 \u03b1 ?\u03bb\u03c6\u03b1 Alpha [a],[a?] [a] \u963f\u5c14\u6cd5 \u89d2\u5ea6\uff1b\u7cfb\u6570
\u0392 \u03b2 \u03b2?\u03c4\u03b1 Beta [b] [v] \u8d1d\u5854 \u89d2\u5ea6\uff1b\u7cfb\u6570
\u0394 \u03b4 \u03b4?\u03bb\u03c4\u03b1 Delta [d] [ð] \u5fb7\u5c14\u5854 \u53d8\u52a8\uff1b\u6c42\u6839\u516c\u5f0f
\u0395 \u03b5 ?\u03c8\u03b9\u03bb\u03bf\u03bd Epsilon [e] [e] \u4f0a\u666e\u897f\u9686 \u5bf9\u6570\u4e4b\u57fa\u6570
\u0396 \u03b6 \u03b6?\u03c4\u03b1 Zeta [zd] [z] \u6cfd\u5854 \u7cfb\u6570\uff1b
\u0398 \u03b8 \u03b8?\u03c4\u03b1 Theta [t?] [\u03b8] \u897f\u5854 \u6e29\u5ea6\uff1b\u76f8\u4f4d\u89d2
\u0399 \u03b9 \u03b9?\u03c4\u03b1 Iota [i] [i] \u7ea6\u5854 \u5fae\u5c0f\uff0c\u4e00\u70b9\u513f
\u039b \u03bb \u03bb?\u03bc\u03b2\u03b4\u03b1(\u73b0\u4e3a\u03bb?\u03bc\u03b4\u03b1) Lambda [l] [l] \u5170\u59c6\u8fbe \u6ce2\u957f\uff08\u5c0f\u5199\uff09\uff1b\u4f53\u79ef
\u039c \u03bc \u03bc\u03c5(\u73b0\u4e3a\u03bc\u03b9) Mu [m] [m] \u8c2c \u5fae\uff08\u5343\u5206\u4e4b\u4e00\uff09\uff1b\u653e\u5927\u56e0\u6570\uff08\u5c0f\u5199\uff09
\u039e \u03be \u03be\u03b9 Xi [ks] [ks] \u514b\u897f \u968f\u673a\u53d8\u91cf
\u03a0 \u03c0 \u03c0\u03b9 Pi [p] [p] \u6d3e \u5706\u5468\u7387=\u5706\u5468\u00f7\u76f4\u5f84\u22483.1416
\u03a3 \u03c3 \u03c3?\u03b3\u03bc\u03b1 Sigma [s] [s] \u897f\u683c\u739b \u603b\u548c\uff08\u5927\u5199\uff09
\u03a4 \u03c4 \u03c4\u03b1\u03c5 Tau [t] [t] \u9676 \u65f6\u95f4\u5e38\u6570
\u03a6 \u03c6 \u03c6\u03b9 Phi [p?] [f] \u5f17\u7231 \u8f85\u52a9\u89d2
\u03a9 \u03c9 \u03c9\u03bc?\u03b3\u03b1 Omega [??] [o] \u6b27\u7c73\u5496 \u89d2
\u6570\u5b66\u7b26\u53f7\u7684\u610f\u4e49
\u7b26\u53f7(Symbol)\u3000\u610f\u4e49(Meaning)
= \u7b49\u4e8e is equal to
\u2260 \u4e0d\u7b49\u4e8e is not equal to
< \u5c0f\u4e8e is less than
> \u5927\u4e8e is greater than
|| \u5e73\u884c is parallel to
\u2265 \u5927\u4e8e\u7b49\u4e8e is greater than or equal to
\u2264 \u5c0f\u4e8e\u7b49\u4e8e is less than or equal to
\u2261\u3000\u6052\u7b49\u4e8e\u6216\u540c\u4f59
\u03c0 \u5706\u5468\u7387
|x| \u7edd\u5bf9\u503c absolute value of X \u223d \u76f8\u4f3c is similar to
\u224c \u5168\u7b49 is equal to(especially for triangle )
>>\u8fdc\u8fdc\u5927\u4e8e\u53f7
<< \u8fdc\u8fdc\u5c0f\u4e8e\u53f7
\u222a\u3000\u5e76\u96c6
\u2229\u3000\u4ea4\u96c6
⊆ \u5305\u542b\u4e8e
\u2299 \u5706
\ \u6c42\u5546\u503c
\u03b2 bet \u78c1\u901a\u7cfb\u6570\uff1b\u89d2\u5ea6\uff1b\u7cfb\u6570\uff08\u6570\u5b66\u4e2d\u5e38\u7528\u4f5c\u8868\u793a\u672a\u77e5\u89d2\uff09
\u03c6 fai \u78c1\u901a\uff1b\u89d2\uff08\u6570\u5b66\u4e2d\u5e38\u7528\u4f5c\u8868\u793a\u672a\u77e5\u89d2\uff09
\u221e\u3000\u65e0\u7a77\u5927
ln(x)\u3000\u4ee5e\u4e3a\u5e95\u7684\u5bf9\u6570
lg(x)\u3000\u4ee510\u4e3a\u5e95\u7684\u5bf9\u6570
floor(x)\u3000\u4e0a\u53d6\u6574\u51fd\u6570
ceil(x)\u3000\u4e0b\u53d6\u6574\u51fd\u6570
x mod y\u3000\u6c42\u4f59\u6570
x - floor(x) \u5c0f\u6570\u90e8\u5206
\u222bf(x)dx\u3000\u4e0d\u5b9a\u79ef\u5206
\u222b[a:b]f(x)dx\u3000a\u5230b\u7684\u5b9a\u79ef\u5206
\u2211(n=p,q)f(n) \u8868\u793af(n)\u7684n\u4ecep\u5230q\u9010\u6b65\u53d8\u5316\u5bf9f(n)\u7684\u8fde\u52a0\u548c\uff0c
∑,读作：西格马,数学中是一个求和符号。
其上方给出终止值，下方给出起始值，后方则是适用此条件的表达式。
如：Sn=∑(k=1)(n)(Ak),
(上式中括号中的内容按照下,上,后的顺序给出) ,
读作：将Ak（这是一个表达式）从A1（从k=1开始）到An（到k=n终止）求和。
lim或limit,是求极限的符号。
如：lim（a趋向于0时）（a+1）
(上式中括号中的内容按照下,后的顺序给出),
读作：limit a趋向于0时 a+1的极限值。
∑,西格马,是一个求和符号,下面给出变量和它的最小值,上面给出最大值,步长为1,后面是一个与下面给出的变量有关的表达式(一个通式或代号),用来指明相加的元素
比如一个数列{An}的前n项和Sn=∑(i=1)(n)(Ai)或Sn=∑(k=1)(n)(Ak),(括号按照下,上,后的顺序给出)
lim,limit,是求极限,下面指明变量从那一方向逼近常量,后面跟该变量的函数表达式就是欲求极限的函数
这些东西书上讲得会详细些
shenme
∑ 求和
lim对数
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