Argument
2
Overview
natural number
Overview adapted from Wikipedia (CC BY-SA 4.0; see the article history for authors).
Possible passages
Found by search and not yet checked by a person; they may only mention the idea in passing.
Imagine all the natural numbers 0, 1, 2, 3, ... to be written down in a row, and immediately beneath them write down the numbers 1, 2, 3, 4, ..., so that 1 is under 0, 2 is under 1, and so on. Then every number in the top row has a number directly under it in the bottom row, and no number occurs twice in either row. It follows that the number of numbers in the two rows must be the same.
Bertrand Russell, Our Knowledge of the External World as a Field for Scientific Method in Philosophy
Names 2 several times; states what 2 is.
TABLE 2/10. Ipomoea purpurea (Ninth Generation). Heights of Plants in inches: Column 1: Number (Name) of Pot. Column 2: Crossed Plants. Column 3: Self-fertilised Plants. Pot 1 : 83 4/8 : 57. Pot 1 : 85 4/8 : 71. Pot 1 : 83 4/8 : 48 3/8. Pot 2 : 83 2/8 : 45. Pot 2 : 64 2/8 : 43 6/8. Pot 2 : 64 3/8 : 38 4/8. Pot 3 : 79 : 63. Pot 3 : 88 1/8 : 71. Pot 3 : 61 : 89 4/8. Pot 4 : 82 4/8 : 82 4/8. Pot 4 : 90 : 76 1/8. Pot 5…
Charles Darwin, The Effects of Cross & Self-Fertilisation in the Vegetable Kingdom
Names 2 several times; opens on 2.
Nor is this the prerogative of numbers alone, and propositions made about several of them; but even natural philosophy, and all the other sciences, afford propositions which are sure to meet with assent as soon as they are understood.
John Locke, An Essay Concerning Humane Understanding, Volume 1
States what 2 is; the book is titled for 2.
Related ideas
- Dualism in cosmology
- Integer
- Necessity and sufficiency
- Culture
- Western world
- Natural number
- Number
- Old English
- Religion
- Spirituality
- Bit
- 0
- Cambridge University Press
- Arabic
Place in the tradition
Part of Propositional logic.