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16 | <h1>Term Logic</h1> |
17 | <div class="contents"> |
18 | <dl> |
19 | <dt> |
20 | <a href="#sec1">Definition</a> |
21 | </dt> |
22 | <dt> |
23 | <a href="#sec2">Propositions</a> |
24 | </dt> |
25 | <dd> |
26 | <dl> |
27 | <dt> |
28 | <a href="#sec3">Relations of Propositional Categories</a> |
29 | </dt> |
30 | <dd> |
31 | <dl> |
32 | <dt> |
33 | <a href="#sec4">A to E — Negation</a> |
34 | </dt> |
35 | <dt> |
36 | <a href="#sec5">I to O — Subcontradiction</a> |
37 | </dt> |
38 | <dt> |
39 | <a href="#sec6">A to I / E to O— Implication</a> |
40 | </dt> |
41 | <dt> |
42 | <a href="#sec7">A to O / E to I — Contradiction</a> |
43 | </dt> |
44 | </dl> |
45 | </dd> |
46 | </dl> |
47 | </dd> |
48 | <dt> |
49 | <a href="#sec8">Syllogistic Dialectic</a> |
50 | </dt> |
51 | <dd> |
52 | <dl> |
53 | <dt> |
54 | <a href="#sec9">Modus Ponens (Affirming the Antecedent)</a> |
55 | </dt> |
56 | <dt> |
57 | <a href="#sec10">Modus Tollens (Denying the Consequent)</a> |
58 | </dt> |
59 | </dl> |
60 | </dd> |
61 | <dt> |
62 | <a href="#sec11">Sources</a> |
63 | </dt> |
64 | <dd> |
65 | <dl> |
66 | <dt> |
67 | <a href="#sec12"><em>Prior Analytics</em></a> |
68 | </dt> |
69 | </dl> |
70 | </dd> |
71 | </dl> |
72 | </div> |
73 | |
74 | |
75 | <!-- Page published by Emacs Muse begins here --><h2><a name="sec1" id="sec1"></a> |
76 | Definition</h2> |
77 | |
78 | <p class="first">Term logic is the classical form of logic used by the followers of |
79 | Aristotle (i.e. all of Europe) prior to the advent of modern predicate |
80 | logic. A basic knowledge of it is fundamental to understanding |
81 | European and Greek philosophical texts written prior to around the |
82 | mid-1800s. I have written this page as a set of notes for myself to |
83 | assist with formulating the structure of the enthymemes presented in |
84 | <em>Rhetoric</em>.</p> |
85 | |
86 | |
87 | |
88 | <h2><a name="sec2" id="sec2"></a> |
89 | Propositions</h2> |
90 | |
91 | <p class="first">There are four categories of propositions in term logic</p> |
92 | |
93 | <ul> |
94 | <li>A: Universal affirmative <!-- $\forall P \exists Q P |
95 | \rightarrow Q$--><img src="img/latex/latex2png-Term Logic__1820230203588184659.png" alt="latex2png equation" class="latex-inline" /></li> |
96 | <li>E: Universal negative <!-- $\forall P \exists Q P |
97 | \rightarrow \neg Q$--><img src="img/latex/latex2png-Term Logic__1990139104632252084.png" alt="latex2png equation" class="latex-inline" /></li> |
98 | <li>I: Particular affirmative <!-- $\exists P \exists Q P |
99 | \rightarrow Q$--><img src="img/latex/latex2png-Term Logic__1820230203585672063.png" alt="latex2png equation" class="latex-inline" /></li> |
100 | <li>O: Particular negative <!-- $\exists P \exists Q P |
101 | \rightarrow \neg Q$--><img src="img/latex/latex2png-Term Logic__1990136469440439988.png" alt="latex2png equation" class="latex-inline" /></li> |
102 | </ul> |
103 | |
104 | <h3><a name="sec3" id="sec3"></a> |
105 | Relations of Propositional Categories</h3> |
106 | |
107 | <h4><a name="sec4" id="sec4"></a> |
108 | A to E — Negation</h4> |
109 | |
110 | <p class="first">Universal affirmatives and universal negatives stand in the most |
111 | important dialectical relationship: they cannot both be true.</p> |
112 | |
113 | |
114 | <h4><a name="sec5" id="sec5"></a> |
115 | I to O — Subcontradiction</h4> |
116 | |
117 | <p class="first">Particular affirmatives and particular negatives <em>may</em> simultaneously be |
118 | true, but they cannot simultaneously be false.</p> |
119 | |
120 | |
121 | <h4><a name="sec6" id="sec6"></a> |
122 | A to I / E to O— Implication</h4> |
123 | |
124 | <p class="first">The universal affirmative implies the particular affirmative; likewise |
125 | for the universal and particular negative.</p> |
126 | |
127 | |
128 | <!-- \[ \forall P \exists Q P \rightarrow Q \vdash \exists P |
129 | \exists Q P \rightarrow Q \]--><p><img src="img/latex/latex2png-Term Logic__662057013302028111.png" alt="latex2png equation" class="latex-display" /></p> |
130 | |
131 | <!-- \[ \forall P \exists Q P \rightarrow \neg Q) \vdash \exists P |
132 | \exists Q P \rightarrow \neg Q \]--><p><img src="img/latex/latex2png-Term Logic__2257733438607490157.png" alt="latex2png equation" class="latex-display" /></p> |
133 | |
134 | |
135 | <h4><a name="sec7" id="sec7"></a> |
136 | A to O / E to I — Contradiction</h4> |
137 | |
138 | <p class="first">The universal affirmative contradicts the particular negative; |
139 | likewise for the universal negative and the particular positive.</p> |
140 | |
141 | |
142 | <!-- \[ \forall P \exists Q P \rightarrow Q \not \vdash \exists P |
143 | \exists Q P \rightarrow \neg Q \]--><p><img src="img/latex/latex2png-Term Logic__930112774001846957.png" alt="latex2png equation" class="latex-display" /></p> |
144 | |
145 | <!-- \[ \forall P \exists Q P \rightarrow \neg Q \not \vdash |
146 | \exists P \exists Q P \rightarrow Q \]--><p><img src="img/latex/latex2png-Term Logic__1000903687973200244.png" alt="latex2png equation" class="latex-display" /></p> |
147 | |
148 | |
149 | |
150 | |
151 | <h2><a name="sec8" id="sec8"></a> |
152 | Syllogistic Dialectic</h2> |
153 | |
154 | <!-- \[ |
155 | \begin{array}{lcl} |
156 | A & \text{R} & B \\ |
157 | C & \text{R} & A \\ |
158 | C & \text{R} & B |
159 | \end{array} |
160 | \]--><p><img src="img/latex/latex2png-Term Logic__1578431659330548867.png" alt="latex2png equation" class="latex-display" /></p> |
161 | |
162 | <p>Where <strong>R</strong> is one of the aforementioned relations.</p> |
163 | |
164 | <h3><a name="sec9" id="sec9"></a> |
165 | Modus Ponens (Affirming the Antecedent)</h3> |
166 | |
167 | <!-- \[ P \rightarrow Q, Q \vdash P \]--><p><img src="img/latex/latex2png-Term Logic__1704608037914088017.png" alt="latex2png equation" class="latex-display" /></p> |
168 | |
169 | |
170 | <h3><a name="sec10" id="sec10"></a> |
171 | Modus Tollens (Denying the Consequent)</h3> |
172 | |
173 | <!-- \[ P \rightarrow Q, \neg Q \vdash \neg P \]--><p><img src="img/latex/latex2png-Term Logic__598849921279338722.png" alt="latex2png equation" class="latex-display" /></p> |
174 | |
175 | |
176 | |
177 | <h2><a name="sec11" id="sec11"></a> |
178 | Sources</h2> |
179 | |
180 | <h3><em><a name="sec12" id="sec12"></a>Prior Analytics</em></h3> |
181 | |
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