The Causal Nexus The "causal nexus" is the necessary connection between cause and effect, which Kant, for instance, argued for (Immanuel Kant, The Critique of Pure Reason, 1781, First Division: Transcendental Analytic, Book II, chapter II, section 3, Second Analogy). By contrast, Wittgenstein (Tractatus Logico-Philosophicus, 1921, 5.1361) wrote: "belief in the causal nexus is superstition". In fact, there are various possible views about the the relations between events, tabulated here:

and

(v) some events have a cause and an effect
(vi) some events have a cause or an effect
(vii) some events have a cause
(viii) some events have an effect

(xiii) no event has either a cause or an effect
(xiv) no event has both a cause and an effect
(xv) no event has a cause
(xvi) no event has an effect

nexus

So long as we agree that there is a causal nexus [i.e. so long as we affirm one of the propositions from (i) to (viii)], it is wrong to say (like Monod) that there could be two events in the universe which could not be causally linked;

this is because, in any nexus, there can be a connection of some sort between any two nodes.

Furthermore, if we have a strong nexus (types (i) - (iv)), there will be a connection between any two nodes (on pain of having more than one universe, each inaccessible to the other).

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