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    <p><a href="/tags/prolog%20or%20iso-prolog%20or%20dcg%20or%20constraint-programming%20or%20logic-programming%20or%20yap%20or%20swi-prolog%20or%20sicstus-prolog%20or%20gnu-prolog%20or%20b-prolog%20or%20xsb%20or%20clpfd%20or%20successor-arithmetics%20or%20prolog-cut%20or%20prolog-dif%20or%20failure-slice%20or%20prolog-toplevel%20or%20answer-set-programming%20or%20theorem-proving">[Prolog related]</a> <a href="/tags/yap%20or%20swi-prolog%20or%20sicstus-prolog%20or%20gnu-prolog%20or%20eclipse-clp%20or%20b-prolog%20or%20xsb">[Prolog systems]</a> <a href="/questions/tagged/iso-prolog" class="post-tag" title="show questions tagged &#39;iso-prolog&#39;" rel="tag">iso-prolog</a> <a href="/tags/postscript%20or%20ghostscript%20or%20curry%20or%20mercury%20or%20golog%20or%20progol">[others]</a></p> <p>Are you wondering why Prolog loops so often? Read <a href="/a/10141181/772868">this</a> using a <a href="/questions/tagged/failure-slice" class="post-tag" title="show questions tagged &#39;failure-slice&#39;" rel="tag">failure-slice</a>. Failure slices provide a lower bound for the number of inferences. E.g. <a href="/a/19941560/772868">the largest integer</a> or <a href="/a/14288853/772868">factors</a>.</p> <p>The <a href="http://www.complang.tuwien.ac.at/ulrich/iso-prolog/prologue" rel="nofollow noreferrer">Prolog prologue</a> attempts to make Prolog systems more uniform. Help put the <a href="/questions/tagged/dcg" class="post-tag" title="show questions tagged &#39;dcg&#39;" rel="tag">dcg</a> formalism on a <a href="http://www.complang.tuwien.ac.at/ulrich/iso-prolog/#dcg" rel="nofollow noreferrer">normative basis</a>! Use SO for <a href="/tags/iso-prolog+dcg">factual questions</a> around.</p> <p><a href="/q/15709808/772868">Features of good Prolog code</a>. <a href="/a/47533255/772868">How to identify redundant answers</a>.</p> <pre><code>?- <b>maplist(dif(X),Xs).</b> Xs = [] ; Xs = [_A], dif(X,_A) ; Xs = [_A,_B], dif(X,_A), dif(X,_B) ; Xs = [_A,_B,_C], dif(X,_A), dif(X,_B), dif(X,_C) ; ...</code></pre> <p>Whose mind is not touched by such pure beauty? More: <a href="/a/27358600/772868"><code>if_/3</code></a>, <code>(=)/3</code>, <a href="/a/22026153/772868"><code>memberd_t/3</code></a>, <a href="/a/22053194/772868"><code>tfilter/3</code></a>, <a href="/a/33456560/772868"><code>tmember/2</code></a>, <a href="/a/36431808/772868"><code>(',')/3</code></a>, <a href="/a/6683502/772868"><code>maplist/2,3,4...</code></a>, <code>closure/3</code>, <a href="/q/26946133/772868"><code>closure0/3</code></a>, <a href="/q/30328433/772868"><code>path/4</code></a>, <a href="/tags/prolog+lambda"><code>λ</code></a>, <a href="/a/20238931/772868"><code>iso_dif/2</code></a>, <a href="/a/21971885/772868"><code>memberd/2</code></a>, <a href="/a/10322639/772868"><code>non_member/2</code></a>, <a href="/a/21994498/772868"><code>all//1</code></a>, <a href="/a/24106828/772868"><code>all_seq//2</code></a>, <a href="/a/40449516/772868"><code>iwhen/2</code></a>, <a href="/a/24725440/772868"><code>call_nub/1</code></a>, <a href="/a/12942551/772868"><code>call_semidet/1</code></a>, <a href="/a/11400256/772868"><code>call_nth/2</code></a>. You have more?<hr><sub><strong>Close-voted/Closed/deleted questions.</strong> Help to reformulate/reopen them! SO rules are difficult: <a href="/q/130097">Real world Prolog usage</a>, <a href="/q/6454022">A prologue for Prolog</a>, <a href="/q/15435462">Prolog systems in Javascript</a>, <a href="/q/130097">Prolog usage</a>, <a href="/q/1759877">Job thanks to Prolog skills?</a> <a href="/q/401635">Beginner's material</a>, <a href="/q/40308854">Syllabes</a></p> <p><strong><a href="/tags/prolog/info">Prolog tags</a></strong>. Still here? So I can tell you: my handle is vocative.</sub> ..........................................................................................................................................................................................................................................</p>
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    2. POParsing with DCGs in Scheme (without Prolog)?
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    3. POWhat is SML used for?
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      1. POHow to set max-width for all human readable text (not for tables &ct)
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      1. POHow to set max-width for all human readable text (not for tables &ct)
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      1. POUsing phrase_from_file to read a file's lines
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    1. COThat does not solve the problem with `add2(0+0+0,0,R)`.
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    2. COIt is more uniform: So extracting features is much simpler. Putting features into arguments of some compound terms means that you have to write access code for each kind of compound term.
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    3. CO@danportin: Above grammar is the starting point. You need to unfold it several times to obtain the non-palindrome version. It explains why the middle `T` where `(a|b)*` would be good enough contains this complex structure that confused @Abhijith.
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