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Principia mathematica, vol. 2 (of 3)

Volume 1 / Part 4 — *177. PROPOSITIONS CONNECTING WITH PRODUCTS AND POWERS.

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*177. PROPOSITIONS CONNECTING WITH PRODUCTS AND POWERS.

Summary of *177.

The principal proposition on this subject is

*177*13.

which is the analogue of *116·72, or rather leads to the analogue of *116·72 as soon as powers of relation-numbers have been defined; for then it becomes Another proposition is an extension of *171·69, namely

*177·22.

where we put .

The remaining propositions of this number are lemmas for the above two.

*177·13 shows, for example, that all classes of finite integers can be arranged in a series of which the relation-number is , where is the relation-number of the series of finite integers. is not the relation-number of the continuum, but is closely allied to it.

*177·1.

In the propositions of *116 referred to, and appear in place of and , but no property of and is used in the proof except .

*177·11.

Dem.

*177·12.

*177·13.

*177·2.

*177·21.

The proof proceeds as the proof of *174·24 proceeds. If , we shall have, if ,

Hence we easily obtain whence whence the result follows easily.

*177·22.

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