<p>Hence in the case of affirmatives; an extensive judgment is expressed by the formula:</p>
<p>Hence in the case of affirmatives; an extensive judgment is expressed by the formula:</p>
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<center>''A'' is contained under ''B'',</center>
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| align="center" | <p>''A'' is contained under ''B'',</p>
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<p>an equivalent intensive proposition by the formula:</p>
<p>an equivalent intensive proposition by the formula:</p>
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| align="center" | <p>''B'' is contained in ''A''.</center>
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<p>Thus ''black horse'' is contained under ''horse'', and ''horse'' [is contained in ''black horse''].</p>
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<center>''B'' is contained in ''A''.</center>
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<p>(Peirce 1865, Harvard Lecture 10 : Grounds of Induction, CE 1, 272).</p>
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<p>Thus ''black horse'' is contained under ''horse'', and ''horse'' [is contained in ''black horse'']. (Peirce 1865, "Harvard Lecture 10. Grounds of Induction", CE 1, 272).</p>