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Signed-off-by: Abdulkadir Furkan Şanlı <abdulocracy@disroot.org>
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Abdulkadir Furkan Şanlı 2019-12-17 16:32:27 +01:00
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<div class="post-content"> <div class="post-content">
<p><image src="face.jpg" width="173" height="150" /></p> <p><!-- raw HTML omitted --></p>
<ul> <ul>
<li>name: Abdulkadir Furkan Şanlı</li> <li>name: Abdulkadir Furkan Şanlı</li>
<li>handle: abdulocracy</li> <li>handle: abdulocracy</li>
<li>contact: <li>contact:
<ul> <ul>
<li>email: my handle at disroot dot org</li> <li>email: my handle at disroot dot org</li>
<li>irc (freenode): abdulocracy</li> <li>irc (freenode): abdulocracy</li>
</ul></li> </ul>
</li>
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<title>abdulocracy&#39;s personal site</title> <title>abdulocracy&#39;s personal site</title>
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<div class="post-content"> <div class="post-content">
Mathematics without infinitely small, continuous mathematical objects. The mathematics of finite sets. Propositional calculus Comes from the linguistic concept that things can be either true or false. We should avoid variables when forming statements, as they may change the logical value. (2=7) statement (x=5) not a statement In logic we do not use the equals sign, we use the equivalence sign (\equiv). Logical values (booleans) are denoted by either 0 or 1 (or t, f, etc. Mathematics without infinitely small, continuous mathematical objects. The mathematics of finite sets. Propositional calculus Comes from the linguistic concept that things can be either true or false.
We should avoid variables when forming statements, as they may change the logical value.
(2=7) statement (x=5) not a statement In logic we do not use the equals sign, we use the equivalence sign (\equiv).
Logical values (booleans) are denoted by either 0 or 1 (or t, f, etc.
</div> </div>

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<pubDate>Wed, 20 Nov 2019 00:00:00 +0000</pubDate> <pubDate>Wed, 20 Nov 2019 00:00:00 +0000</pubDate>
<guid>https://abdulocra.cy/posts/eidma/</guid> <guid>https://abdulocra.cy/posts/eidma/</guid>
<description>Mathematics without infinitely small, continuous mathematical objects. The mathematics of finite sets. Propositional calculus Comes from the linguistic concept that things can be either true or false. We should avoid variables when forming statements, as they may change the logical value. \(2=7\) statement \(x=5\) not a statement In logic we do not use the equals sign, we use the equivalence sign \(\equiv\). Logical values (booleans) are denoted by either 0 or 1 (or t, f, etc.</description> <description>Mathematics without infinitely small, continuous mathematical objects. The mathematics of finite sets. Propositional calculus Comes from the linguistic concept that things can be either true or false.
We should avoid variables when forming statements, as they may change the logical value.
\(2=7\) statement \(x=5\) not a statement In logic we do not use the equals sign, we use the equivalence sign \(\equiv\).
Logical values (booleans) are denoted by either 0 or 1 (or t, f, etc.</description>
</item> </item>
<item> <item>
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<pubDate>Mon, 04 Nov 2019 00:00:00 +0000</pubDate> <pubDate>Mon, 04 Nov 2019 00:00:00 +0000</pubDate>
<guid>https://abdulocra.cy/about/</guid> <guid>https://abdulocra.cy/about/</guid>
<description> name: Abdulkadir Furkan Şanlı handle: abdulocracy contact: email: my handle at disroot dot org irc (freenode): abdulocracy </description> <description> name: Abdulkadir Furkan Şanlı handle: abdulocracy contact: email: my handle at disroot dot org irc (freenode): abdulocracy </description>
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We should avoid variables when forming statements, as they may change the logical value.
\(2=7\) statement \(x=5\) not a statement In logic we do not use the equals sign, we use the equivalence sign \(\equiv\).
Logical values (booleans) are denoted by either 0 or 1 (or t, f, etc."/>
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<meta name="twitter:description" content="Mathematics without infinitely small, continuous mathematical objects. The mathematics of finite sets. Propositional calculus Comes from the linguistic concept that things can be either true or false. We should avoid variables when forming statements, as they may change the logical value. \(2=7\) statement \(x=5\) not a statement In logic we do not use the equals sign, we use the equivalence sign \(\equiv\). Logical values (booleans) are denoted by either 0 or 1 (or t, f, etc." /> <meta name="twitter:description" content="Mathematics without infinitely small, continuous mathematical objects. The mathematics of finite sets. Propositional calculus Comes from the linguistic concept that things can be either true or false.
We should avoid variables when forming statements, as they may change the logical value.
\(2=7\) statement \(x=5\) not a statement In logic we do not use the equals sign, we use the equivalence sign \(\equiv\).
Logical values (booleans) are denoted by either 0 or 1 (or t, f, etc." />
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We should avoid variables when forming statements, as they may change the logical value.
\(2=7\) statement \(x=5\) not a statement In logic we do not use the equals sign, we use the equivalence sign \(\equiv\).
Logical values (booleans) are denoted by either 0 or 1 (or t, f, etc." />
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</ul> </ul>
<h2 id="propositional-calculus">Propositional calculus</h2> <h2 id="propositional-calculus">Propositional calculus</h2>
<ul> <ul>
<li>Comes from the linguistic concept that things can be either true or false.</li> <li><p>Comes from the linguistic concept that things can be either true or false.</p></li>
<li>We should avoid variables when forming statements, as they may change the logical value. <li><p>We should avoid variables when forming statements, as they may change the logical value.</p>
<ul> <ul>
<li><span class="math inline">\(2=7\)</span> statement</li> <li><span class="math inline">\(2=7\)</span> statement</li>
<li><span class="math inline">\(x=5\)</span> not a statement</li> <li><span class="math inline">\(x=5\)</span> not a statement</li>
</ul></li> </ul></li>
<li>In logic we do not use the equals sign, we use the equivalence sign <span class="math inline">\(\equiv\)</span>.</li> <li><p>In logic we do not use the equals sign, we use the equivalence sign <span class="math inline">\(\equiv\)</span>.</p></li>
<li>Logical values (booleans) are denoted by either 0 or 1 (or t, f, etc.).</li> <li><p>Logical values (booleans) are denoted by either 0 or 1 (or t, f, etc.).</p></li>
<li>When doing logic, we use propositional variables (e.g. p, q, r). <li><p>When doing logic, we use propositional variables (e.g. p, q, r).</p>
<ul> <ul>
<li>Can be either <strong>true</strong> or <strong>false</strong>.</li> <li>Can be either <strong>true</strong> or <strong>false</strong>.</li>
</ul></li> </ul></li>
<li>The operations done on propositional variables are called propositional connectives. <li><p>The operations done on propositional variables are called propositional connectives.</p>
<ul> <ul>
<li>Conjunction: <span class="math inline">\(p \land q\)</span> is only true if both p and q are true <span class="math inline">\((0001)\)</span></li> <li>Conjunction: <span class="math inline">\(p \land q\)</span> is only true if both p and q are true <span class="math inline">\((0001)\)</span></li>
<li>Disjunction: <span class="math inline">\(p \lor q\)</span> is only false if both p and q are false <span class="math inline">\((0111)\)</span></li> <li>Disjunction: <span class="math inline">\(p \lor q\)</span> is only false if both p and q are false <span class="math inline">\((0111)\)</span></li>
@ -179,11 +188,11 @@
<li><span class="math inline">\(\equiv \neg p \lor q\)</span></li> <li><span class="math inline">\(\equiv \neg p \lor q\)</span></li>
</ul></li> </ul></li>
</ul></li> </ul></li>
<li>Not necessarily connectives but unary operations: <li><p>Not necessarily connectives but unary operations:</p>
<ul> <ul>
<li>Negation: Denoted by ~, <span class="math inline">\(\neg\)</span> or NOT, negates the one input <span class="math inline">\((10)\)</span>.</li> <li>Negation: Denoted by ~, <span class="math inline">\(\neg\)</span> or NOT, negates the one input <span class="math inline">\((10)\)</span>.</li>
</ul></li> </ul></li>
<li>A (propositional) formula is a “properly constructed” logical expression. <li><p>A (propositional) formula is a “properly constructed” logical expression.</p>
<ul> <ul>
<li>e.g. <span class="math inline">\(\neg[(p \lor q)] \land r\)</span></li> <li>e.g. <span class="math inline">\(\neg[(p \lor q)] \land r\)</span></li>
<li><span class="math inline">\((p \land)\)</span> is not a formula, as <span class="math inline">\(\land\)</span> requires 2 variables.</li> <li><span class="math inline">\((p \land)\)</span> is not a formula, as <span class="math inline">\(\land\)</span> requires 2 variables.</li>
@ -196,10 +205,10 @@
<li><span class="math inline">\(\neg(B \lor C)\)</span> can be written as <span class="math inline">\(\neg B \land \neg C\)</span></li> <li><span class="math inline">\(\neg(B \lor C)\)</span> can be written as <span class="math inline">\(\neg B \land \neg C\)</span></li>
</ul></li> </ul></li>
</ul></li> </ul></li>
<li>Double negation law: <span class="math inline">\(\neg(\neg p) \equiv p\)</span></li> <li><p>Double negation law: <span class="math inline">\(\neg(\neg p) \equiv p\)</span></p></li>
<li><p>De Morgans laws: <span class="math inline">\(\neg(p \land q) \equiv \neg p \lor \neg q\)</span> and <span class="math inline">\(\neg(p \lor q) \equiv \neg p \land \neg q\)</span>.</p></li> <li><p>De Morgans laws: <span class="math inline">\(\neg(p \land q) \equiv \neg p \lor \neg q\)</span> and <span class="math inline">\(\neg(p \lor q) \equiv \neg p \land \neg q\)</span>.</p></li>
<li>If and only if (<em>iff</em>): <span class="math inline">\(p \iff p \equiv (p \implies q) \land (q \implies p)\)</span></li> <li><p>If and only if (<em>iff</em>): <span class="math inline">\(p \iff p \equiv (p \implies q) \land (q \implies p)\)</span></p></li>
<li>Contraposition law: <li><p>Contraposition law:</p>
<ul> <ul>
<li><span class="math inline">\((p \implies q) \equiv (\neg q \implies \neg p)\)</span> prove by contraposition <li><span class="math inline">\((p \implies q) \equiv (\neg q \implies \neg p)\)</span> prove by contraposition
<ul> <ul>
@ -207,7 +216,7 @@
<li><span class="math inline">\((\neg q \implies \neg p) \equiv (\neg (\neg q) \lor (\neg p) \equiv (q \lor \neg p) \equiv (\neg p \lor q)\)</span></li> <li><span class="math inline">\((\neg q \implies \neg p) \equiv (\neg (\neg q) \lor (\neg p) \equiv (q \lor \neg p) \equiv (\neg p \lor q)\)</span></li>
</ul></li> </ul></li>
</ul></li> </ul></li>
<li>Contradiction law: <li><p>Contradiction law:</p>
<ul> <ul>
<li><span class="math inline">\(p \lor \neg p \equiv 1\)</span> and <span class="math inline">\(p \land \neg p \equiv 0\)</span></li> <li><span class="math inline">\(p \lor \neg p \equiv 1\)</span> and <span class="math inline">\(p \land \neg p \equiv 0\)</span></li>
</ul></li> </ul></li>

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<div class="post-content"> <div class="post-content">
Mathematics without infinitely small, continuous mathematical objects. The mathematics of finite sets. Propositional calculus Comes from the linguistic concept that things can be either true or false. We should avoid variables when forming statements, as they may change the logical value. (2=7) statement (x=5) not a statement In logic we do not use the equals sign, we use the equivalence sign (\equiv). Logical values (booleans) are denoted by either 0 or 1 (or t, f, etc. Mathematics without infinitely small, continuous mathematical objects. The mathematics of finite sets. Propositional calculus Comes from the linguistic concept that things can be either true or false.
We should avoid variables when forming statements, as they may change the logical value.
(2=7) statement (x=5) not a statement In logic we do not use the equals sign, we use the equivalence sign (\equiv).
Logical values (booleans) are denoted by either 0 or 1 (or t, f, etc.
</div> </div>

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@ -18,7 +18,10 @@
<pubDate>Wed, 20 Nov 2019 00:00:00 +0000</pubDate> <pubDate>Wed, 20 Nov 2019 00:00:00 +0000</pubDate>
<guid>https://abdulocra.cy/posts/eidma/</guid> <guid>https://abdulocra.cy/posts/eidma/</guid>
<description>Mathematics without infinitely small, continuous mathematical objects. The mathematics of finite sets. Propositional calculus Comes from the linguistic concept that things can be either true or false. We should avoid variables when forming statements, as they may change the logical value. \(2=7\) statement \(x=5\) not a statement In logic we do not use the equals sign, we use the equivalence sign \(\equiv\). Logical values (booleans) are denoted by either 0 or 1 (or t, f, etc.</description> <description>Mathematics without infinitely small, continuous mathematical objects. The mathematics of finite sets. Propositional calculus Comes from the linguistic concept that things can be either true or false.
We should avoid variables when forming statements, as they may change the logical value.
\(2=7\) statement \(x=5\) not a statement In logic we do not use the equals sign, we use the equivalence sign \(\equiv\).
Logical values (booleans) are denoted by either 0 or 1 (or t, f, etc.</description>
</item> </item>
</channel> </channel>

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<div class="post-content"> <div class="post-content">
Mathematics without infinitely small, continuous mathematical objects. The mathematics of finite sets. Propositional calculus Comes from the linguistic concept that things can be either true or false. We should avoid variables when forming statements, as they may change the logical value. (2=7) statement (x=5) not a statement In logic we do not use the equals sign, we use the equivalence sign (\equiv). Logical values (booleans) are denoted by either 0 or 1 (or t, f, etc. Mathematics without infinitely small, continuous mathematical objects. The mathematics of finite sets. Propositional calculus Comes from the linguistic concept that things can be either true or false.
We should avoid variables when forming statements, as they may change the logical value.
(2=7) statement (x=5) not a statement In logic we do not use the equals sign, we use the equivalence sign (\equiv).
Logical values (booleans) are denoted by either 0 or 1 (or t, f, etc.
</div> </div>

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@ -18,7 +18,10 @@
<pubDate>Wed, 20 Nov 2019 00:00:00 +0000</pubDate> <pubDate>Wed, 20 Nov 2019 00:00:00 +0000</pubDate>
<guid>https://abdulocra.cy/posts/eidma/</guid> <guid>https://abdulocra.cy/posts/eidma/</guid>
<description>Mathematics without infinitely small, continuous mathematical objects. The mathematics of finite sets. Propositional calculus Comes from the linguistic concept that things can be either true or false. We should avoid variables when forming statements, as they may change the logical value. \(2=7\) statement \(x=5\) not a statement In logic we do not use the equals sign, we use the equivalence sign \(\equiv\). Logical values (booleans) are denoted by either 0 or 1 (or t, f, etc.</description> <description>Mathematics without infinitely small, continuous mathematical objects. The mathematics of finite sets. Propositional calculus Comes from the linguistic concept that things can be either true or false.
We should avoid variables when forming statements, as they may change the logical value.
\(2=7\) statement \(x=5\) not a statement In logic we do not use the equals sign, we use the equivalence sign \(\equiv\).
Logical values (booleans) are denoted by either 0 or 1 (or t, f, etc.</description>
</item> </item>
</channel> </channel>