Dialogue

 1 Intro| conception of square and oblong numbers, but he is unable to attain
 2 Intro|        discovered a division of numbers into square numbers, 4,
 3 Intro| division of numbers into square numbers, 4, 9, 16, etc., which are
 4 Intro|         equal sides, and oblong numbers, 3, 5, 6, 7, etc., which
 5 Intro|         mind and sense? e.g. in numbers. No one can confuse the
 6 Intro|    errors in arithmetic. For in numbers and calculation there is
 7 Intro|         power of discriminating numbers, forms, colours, is not
 8 Intro|       us at the time, but, like numbers or algebraical symbols,
 9  Thea|      THEAETETUS: We divided all numbers into two classes: those
10  Thea|    called square or equilateral numbers;—that was one class.~SOCRATES:
11  Thea|    THEAETETUS: The intermediate numbers, such as three and five,
12  Thea|          and called them oblong numbers.~SOCRATES: Capital; and
13  Thea|   squares the equilateral plane numbers, were called by us lengths
14  Thea|        are equal to) the oblong numbers, were called powers or roots;
15  Thea|         also of unity and other numbers which are applied to objects
16  Thea|     soul perceives odd and even numbers and other arithmetical conceptions.~
17  Thea|      ask himself how many these numbers make when added together,
18  Thea|       eleven, and in the higher numbers the chance of error is greater
19  Thea|    assume you to be speaking of numbers in general.~SOCRATES: Exactly;
20  Thea|  perfect arithmetician know all numbers, for he has the science
21  Thea|       he has the science of all numbers in his mind?~THEAETETUS:
22  Thea|      And he can reckon abstract numbers in his head, or things about
23  Thea|      admitted that he knows all numbers;—you have heard these perplexing
24  Thea|       knows all letters and all numbers?~THEAETETUS: That, again,
25  Thea|         other;—when the various numbers and forms of knowledge are
26  Thea|        the same or of different numbers?~THEAETETUS: Of the same.~