User:Alastair Haines/Popper and After

David Hume's scepticism per David Stove

E}

H}

E}

F}

→

M+}

J}

→

→

→

I}

F}

→

N}

O}

→

C}

}

→

M}

}

→

A

H}

→

L

→

K}

D}

}

G}

E}

→

B}

F}

Key
x	Title	Description
A	Scepticism about the unobserved	There is no reason to believe any contingent proposition about the unobserved.
B	Empiricism	Any reason to believe a contingent proposition about the unobserved is a proposition about the observed.
C	Inductive Scepticism	No proposition about the observed is a reason to believe a contingent proposition about the observed.
D	Impotence of the a priori	No necessary truth is a reason to believe any contingent proposition.
E	Accessibles necessary or observational	A proposition is directly accessible to knowledge or reasonable belief if and only if it is either a necessary truth or a proposition about the observed.
F	Reasons must be accessible	If P is a reason or part of a reason to believe Q then P is directly accessible to knowledge or reasonable belief.
G	Induction is invalid without Resemblance	Any inductive argument is invalid, and the validator of it is a Resemblance Thesis.
H	Resemblance is a contingent feature of the Universe	A Resemblance Thesis is a contingent proposition about the unobserved.
I	Resemblance is not provable a priori	A Resemblance Thesis is not deducible from necessary truths.
J	No contingents provable a priori	No contingent proposition is deducible from necessary truths.
K	Resemblance is not provable a posteriori	A Resemblance Thesis is not deducible from propositions about the observed.
L	Induction to Resemblance is circular if valid	A Resemblance Thesis is deducible from propositions about the observed only when to the latter is conjoined a Resemblance Thesis.
M	The validator of induction not necessary or observational	Any inductive argument is invalid, and the validator of it is neither a necessary truth nor a proposition about the observed.
M+	No validator of induction is necessary or observational	Any inductive argument is invalid, and any validator of it is neither a necessary truth nor a proposition about the observed.
N	Invalidity of induction incurable	Any inductive argument is invalid, and any validator of it is not a reason or part of a reason to believe its conclusion.
O	Deductivism	P is a reason to believe Q only if the argument from P to Q is valid, or there is a validator of it which is either a necessary truth or a proposition about the observed.

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