HOME TOP UP PREV NEXT 1 GERMAN MAP Tractatus Logico-Philosophicus 5.532
x, y) . f(x, y) . x=y", but
"(
x) . f(x, x)"; and not
"(
x, y) . f(x, y) . ~x=y", but
"(
x, y) . f(x, y)".
Therefore instead of Russell's
"(
x, y) . f(x, y)" : "(
x, y) . f(x, y) .v. (
x) . f(x, x)".)
x=a" we therefore write
e.g. "(
x) . fx .
. fa : ~(
x, y) . fx . fy".
And if the proposition "only one x
satisfies f( )" reads:
"(
x) . fx : ~(
x, y) . fx . fy".