*24. THE UNIVERSAL CLASS, THE NULL-CLASS, AND THE EXISTENCE OF CLASSES.
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Whitehead, Alfred North and Russell, Bertrand
*24·104.
Dem.
*24·105.
Dem.
*24·11.
Dem.
*24·12.
Dem.
*24·13.
Dem.
*24·14.
Dem.
*24·141.
Dem.
*24·15.
Dem.
*24·17.
*24·21.
*24·22.
*24·23.
*24·24.
The above two propositions (*24·23·24) exhibit the algebraical analogy of to zero.
*24·26.
This exhibits the analogy of to 1.
*24·27.
This exhibits the analogy of to .
*24·3.
Dem.
The above proposition is very frequently used.
*24·31.
Dem.
This proposition is the correlative of *24·3, but, unlike that proposition, it is not useful in the sequel. Every proposition concerning has a correlative concerning , but we shall often not give these correlatives, since they are seldom required for subsequent proofs.
*24·311.
Dem.
*24·312.
Dem.
*24·313.
*24·32.
Dem.
*24·33.