<div dir="auto">I'm not reading this carefully enough. I am selling my car which involves paperwork.<div dir="auto"><br></div><div dir="auto">There are many systems with causal graphs with feedback loops. In genetic regulatory networks, for example. Is that downward causation?</div><div dir="auto"><br></div><div dir="auto">A classic example is the case if two ladders leaning against each other so that neither one falls. Each causes the other not to fall.</div><div dir="auto"><br></div><div dir="auto">Frank<br><br><div data-smartmail="gmail_signature" dir="auto">---<br>Frank C. Wimberly<br>140 Calle Ojo Feliz, <br>Santa Fe, NM 87505<br><br>505 670-9918<br>Santa Fe, NM</div></div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Mon, Jul 20, 2020, 11:26 AM uǝlƃ ↙↙↙ <<a href="mailto:gepropella@gmail.com">gepropella@gmail.com</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">Right. I'm ignorant of Weismann's doctrine. But it does seem to imply purely bottom-up causation. We *could*, I suppose talk of hierarchical systems where the causal flow only went upward ... maybe a bit like the causal cone defined by the speed of light in space-time. Everything within the cone is "same layer causation" and cross-cone relations might be the only time you'd need large-scale, collective effects. [⛧]<br>
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The only way I can see to get any kind of downward causation in that case is through iteration, as I mentioned with the sticks (1st stick is completely free, 2nd stick is more constrained, ...). But you can remove time and replace it with some other requirement, like no/minimal space between tiles for sphere packing or, say, aperiodic tilings. In that case, it's not only the tile shapes, but also *how many* of each shape you have that impinges on their (micro) placement. <br>
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[⛧] This popped up this morning: <a href="https://uwaterloo.ca/astrophysics-centre/news/astrophysicists-release-largest-3d-map-universe-ever-created" rel="noreferrer noreferrer" target="_blank">https://uwaterloo.ca/astrophysics-centre/news/astrophysicists-release-largest-3d-map-universe-ever-created</a><br>
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On 7/20/20 10:07 AM, Jon Zingale wrote:<br>
> Maybe I am misremembering (which clearly happens), but didn't the discussion<br>
> of gen-phen-like maps arise in the context of goal-function distinctions? In<br>
> this latter class, we included the thermostat system where constraining<br>
> systems to Weismann's doctrine would not be meaningful. Clearly, in the<br>
> goal-function system, an individual that changes the thermostat dial because<br>
> they prefer the house to be at 60 degrees rather than 80 degrees (a<br>
> variation on function) performs downwardly to affect the tolerance of the<br>
> piece of metal or mercury switch (a variation on goal). Are we breaking the<br>
> semantic game by now demanding that our admissable gen-phen-like maps<br>
> preserve Weismann's doctrine? I understood Glen's evocation to not be so<br>
> constrained.<br>
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