s682.py

from research import *
s=begin(682,'Separate translation from opening','Can one coordinate rule explain both the120 construction and the2940 closure?',{'changes':{'translate80':[80,80],'open10':[10,-10],'open5':[5,-5]}},['C677,C680,C681'])
changes={'translate80':[80,80],'open10':[10,-10],'open5':[5,-5]}
effects={k:{'center_change':F(a+b,2),'width_change':a-b} for k,(a,b) in changes.items()}
finish(s,{'effects':effects,'general_rule':'delta_c=(delta_U+delta_L)/2; delta_w=delta_U−delta_L'},'Center and width provide a common language for two different mechanisms: translation moves the center while retaining width; symmetric opening widens the body while retaining center. The new sources instantiate both, so no single undifferentiated date shift explains the family.','Continue the admitted alternating ladder across the BC/AD boundary using civil elapsed time.',{'translation':effects['translate80']=={'center_change':80,'width_change':0},'opening':effects['open10']=={'center_change':0,'width_change':20},'final':effects['open5']=={'center_change':0,'width_change':10}})