This is a very interesting project! Could you give me a new, short-hand definition of "critical feedback"? We have defined critical nodes and critical connections (in relation to connected cortical graphs in graph theory, see Gomez and Lopera 1999 Med Hypotheses 1999 Sep;53(3):263-6 https://www.ncbi.nlm.nih.gov/pubmed/10580535), and recently, here in RG, critical subgraphs (https://www.researchgate.net/post/What_is_the_meaning_or_the_meanings_of_a_critical_node_in_cortical_graphs)...

Could you please give me a context-free definition (valid for many systems and sciences) of "critical feedback"? Is it a special case of critical subgraph where we have positive and negative loops? If the meaning is conserved, a critical subgraph represents a subgraph which, if it is extracted from the graph, the graph becomes unconnected. This might be important to define a robust and qualitative general structure in the context of a general mathematical theory of systems...

Thanks for this important research for the current controversy on climate change and the march for science (now called the movement for science https://www.marchforscience.com/mission-and-vision/).

Juan F Gomez PhD, International Group of Neuroscience IGN (I have been recently involved in the study of oscillations in ecology and geophysics, and active in science-related groups of local climate).