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- Vector is denoted as bold lowercase letter, e.g. $\mathbf{a}$, Matrix is denoted as bold capital letter, e.g. $\mathbf{A}$, $a_i$ means the $i$th element of $\mathbf{a}$, $a_{ij}$ means the $(i,j)$th element of $\mathbf{A}$
- Little letters (e.g. $p,q,r$) are used to represent propostional variables
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- $\neg$ is used to represent negation
@@ -79,7 +80,7 @@ title: Forever young
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- $\mathscr{L}$ is used to represent a first-order language
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-`mathscr` upper letters (e.g. $\mathscr{A},\mathscr{B},\mathscr{C}$) are used to represent the formulas (well-formed formulas,wfs) of a language $\mathscr{L}$ and $\mathscr{L}_0$
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## 3. Computer Symbols
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## Computer Symbols
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- Local network is denoted as capital letter, e.g. $A$,$B$,$C$
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- Host in local network is denoted as small letter, e.g. $a$,$b$,$c$ located in local network $A$,$B$,$C$
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