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Cause: two conditions if a variable is to be the cause of its own replication:
1) the size really has to be reproduced,
2) most of its variants may not be reproduced in the same situation. (quantum theory)
For x to be a cause of y, two conditions must apply:
1) both must occur,
2) y would not have to be allowed to occur if x had have been different.
Cause: thinking about causes and effects thus inevitably relates to variants of causes and effects.
Die Physik der Welterkenntnis München 2000