s537.py

from research import *
s=begin(537,'Distinguish bilateral expansion from a mixed comparison','How do the350 and336 displays arise from the same161 spine?',{'original_triple':[1728,1567,1406],'held_midpoint':1567},['File60 §§3.3–3.4'])
v=[1567+E*(x-1567) for x in [1728,1567,1406]]
finish(s,{'uniformly_expanded_triple_diagnostic':v,'uniform_outer_width':v[0]-v[2],'one_arm_expanded_with_original_terminal':v[0]-1406,'historical_outer_width':1728-1406},
 'Both arms expanded give175+175=350. Expanding only the Ishmael arm while retaining the original terminal gives175+161=336. The generated1392 companion is only the algebraic fixed-midpoint display, not a newly admitted historical node.',
 'Resolve the147/161/175 progression and its14-unit connection to later clutch operations.',{'uniform':v==[1742,1567,1392] and v[0]-v[2]==350,'mixed':v[0]-1406==336,'historical':1728-1406==322})