Example code
A chemical memory stores a label in its resident molecules while using the same finite material pool to make product. Success requires both the output quota and preservation of the label in both daughters after division. The example models their joint probability, including intact complexes, one complementary allocation, and the cost of refilling both daughters.
The runnable package provides a six-channel finite-count reactor, editable rates and inventory, exact uncertainty certificates, a designated-lineage simulator, and reusable corridor and cooperative-gate models. Inputs are collected at the top of the driver; the guide explains the count-rate convention and how to extend each component.


For the source that stores its label in which resident species is present, fresh integer certificates establish a robust minimum of 32 material units at quota four and success probability 0.999. Favoring complex dissociation raises that source's minimum to 42. Making only product release faster also breaks the 32-unit guarantee: less recycled food can leave too few carriers for the daughters.
The calculation for memory stored in resident proportions separates a 414-core reference construction, whose joint guarantee exceeds 0.9997, from an exhaustive search over its cooperative-gate class. The class needs core 230 at target 0.999, or core 253 at target 0.9995, plus one fuel token. Its material saving relies on high reaction order and freely chosen rate constants; it is a mathematical architecture, not a calibrated practical chemistry.
All smaller support budgets receive actual exclusion certificates, and the cooperative frontiers are freshly searched. Numerical diagnostics explain the failures but do not supply the certificates. The support rate-box result keeps the two exit constants tied; bias guarantees are specific to the stated constructions. These are architecture-specific frontiers, not universal limits on chemical memory. Lean is not rerun.
Python source
"""Edit these inputs, then run: python example.py --output outputs.
Default run freshly certifies both support frontiers (~several minutes), searches
the cooperative class, and simulates the actual harvest/partition/refill protocol.
"""
INVENTORY = 32
QUOTA = 4
DEADLINE = 5 # model time, fixed-volume count-rate convention
RELEASE_BAND = (10, 20) # tied dissociation and productive release
ALLOCATION_THETA = '1/2'
RATE_BOX_HALF_WIDTH = '1/300' # five groups: the two release channels stay tied
SUPPORT_TARGET = '999/1000'
FRONTIER_BUDGETS = range(15, 43) # each lower budget is checked, never interpolated
COOPERATIVE_TARGETS = [('999/1000',1),('1999/2000',1),('1999/2000',8)]
COOPERATIVE_SEARCH_CAP = 800
REFERENCE_MAJORITY = (65,195,121) # low, high, growth
REFERENCE_MINORITY = (8,64,30)
GATE_FORWARD_FLOOR = '20'
GATE_REVERSE_CEILING = '1/100000'
LINEAGE_CYCLES = 10
RANDOM_SEED = 740023
MANUSCRIPT_SHA256 = 'e95aab6b325f1d7d500ee7f13bf8d287e15f308bf38a561f02e5ebf3d819e32c'
import argparse,csv,hashlib,json,platform
from pathlib import Path
from fractions import Fraction as F
from math import log
import numpy as np
import scipy
from dataclasses import replace
from memory import (SupportReactor,SupportRates,ComplementaryAllocation,IntegerEnvelope,
SerialProtocol,Corridor,CooperativeGate,carrier_floor)
from ctmc_certificate import nominal_groups,SCALE
from frontier_proportion import frontier,verify_endpoint_lemma
from proportion_extras import spread,log10_k
def main():
parser=argparse.ArgumentParser(description=__doc__);parser.add_argument('--output',type=Path,default=Path('outputs'));out=parser.parse_args().output;out.mkdir(parents=True,exist_ok=True)
def dump(name,value): (out/name).write_text(json.dumps(value,indent=2,default=lambda x:str(x) if isinstance(x,F) else x)+'\n')
def table(name,rows):
with (out/name).open('w',newline='') as f:
w=csv.DictWriter(f,fieldnames=list(rows[0]));w.writeheader();w.writerows(rows)
theta=ComplementaryAllocation(F(ALLOCATION_THETA));target=F(SUPPORT_TARGET)
def certify(K,groups,allocation=theta):
r=IntegerEnvelope(K,tuple(groups),DEADLINE,QUOTA,allocation).run()
r['status']='certified' if F(r['lower'],SCALE)>=target else ('excluded' if F(r['upper'],SCALE)<target else 'undetermined')
return r
band=certify(INVENTORY,nominal_groups(*RELEASE_BAND));dump('support_band.json',band)
print('Configured support band:',band['status'],band['lower'],'/',SCALE,flush=True)
nominal=[];untied=[]
for K in FRONTIER_BUDGETS:
if K<=INVENTORY:
r=certify(K,SupportRates().groups());nominal.append(r)
r=certify(K,SupportRates(dissociation=F(20),release=F(10)).groups());untied.append(r)
print('Fresh budget',K,'untied:',r['status'],flush=True)
dump('support_frontiers.json',dict(nominal=nominal,untied=untied,
analytic_exclusion_through=carrier_floor(QUOTA,1,1-target)-1,
scope='Minimum asserted only with continuous coverage of all smaller integers by analytic or upper certificates. No monotonicity in inventory, deadline or individual rates.'))
for name,rows in [('nominal',nominal),('untied',untied)]:
successes=[r['K'] for r in rows if r['status']=='certified']
if successes:
k=min(successes);covered=set(range(2,carrier_floor(QUOTA,1,1-target)))|{r['K'] for r in rows if r['status']=='excluded'}
print(name,'minimum' if set(range(2,k))<=covered else 'certified budget (coverage incomplete)',k,flush=True)
robustness={
'bias_039':certify(INVENTORY,nominal_groups(*RELEASE_BAND),ComplementaryAllocation(F(39,100))),
'bias_038':certify(INVENTORY,nominal_groups(*RELEASE_BAND),ComplementaryAllocation(F(19,50))),
'tied_rate_box':certify(INVENTORY,nominal_groups(*RELEASE_BAND,eps=F(RATE_BOX_HALF_WIDTH))),
'wider_rate_box':certify(INVENTORY,nominal_groups(*RELEASE_BAND,eps=F(1,250))),
'faster_product_release':certify(INVENTORY,SupportRates(dissociation=F(10),release=F(20)).groups())}
dump('support_robustness.json',robustness)
diagnostics=[]
for kd,kr in [(20,10),(10,10),(10,20)]:
reactor=SupportReactor(INVENTORY,SupportRates(dissociation=F(kd),release=F(kr)))
states,values=reactor.deadline(DEADLINE,QUOTA,theta)
assert np.max(np.abs(values[:,:3].sum(axis=1)-1))<1e-9
for z in [(INVENTORY-1,0,0),(0,1,0)]:
v=values[states.index(z)]
diagnostics.append(dict(dissociation=kd,product_release=kr,start=str(z),joint_success=v[0],quota_failure=v[1],allocation_failure_after_quota=v[2],mean_carriers=v[3],mean_food=v[4],mean_product=v[5]))
table('failure_mechanisms.csv',diagnostics)
protocol=SerialProtocol(SupportReactor(INVENTORY),DEADLINE,QUOTA,theta)
lineage=protocol.lineage((INVENTORY-1,0,0),LINEAGE_CYCLES,np.random.default_rng(RANDOM_SEED));dump('designated_lineage.json',lineage)
lower=F(band['lower'],SCALE)
dump('material_and_time_bounds.json',dict(support_carrier_floor=carrier_floor(QUOTA,1,1-target),two_type_carrier_floor=carrier_floor(QUOTA,2,1-target),
lineage_joint_lower=lower**LINEAGE_CYCLES,initial_plus_refills_on_success_at_least=INVENTORY+LINEAGE_CYCLES*(INVENTORY+QUOTA),
harvest_on_success_at_least=LINEAGE_CYCLES*QUOTA,
minimum_tied_release_necessary_display=log(1/float(1-target))/(2*DEADLINE),
scope='Lineage probability bound uses a uniform conditional guarantee and requires no cycle independence. Necessary release threshold is numerical display; material ceiling is exact. Not a whole binary-tree success guarantee.'))
ref=CooperativeGate(Corridor(*REFERENCE_MAJORITY),Corridor(*REFERENCE_MINORITY),QUOTA,F(GATE_FORWARD_FLOOR),F(GATE_REVERSE_CEILING))
def report_gate(g):
X,Y=g.majority,g.minority;k,b=g.constants()
return dict(core=g.core,initial_supply=g.core+1,molecularity=g.molecularity,majority=X.__dict__,minority=Y.__dict__,forward_constant=k,reverse_constant=b,
partition=X.uniform_return()*Y.uniform_return(),joint_lower=g.joint_lower(),ten_cycle_lower=g.joint_lower()**10,
worst_clock_and_partition_need_not_coincide=True,
vertices=[dict(x=x,y=y,forward=g.pair_rates(x,y)[0],reverse=g.pair_rates(x,y)[1],joint_display=g.actual_joint(x,y)) for x in [X.low,X.high] for y in [Y.low,Y.high]])
reference=report_gate(ref);reference['bias']=[dict(theta=str(t),partition=ref.majority.uniform_return(t)*ref.minority.uniform_return(t),joint_lower=ref.joint_lower(t)) for t in [F(1,2),F(49,100),F(12,25)]]
reference['scope']='The 414-core reference and its bias tolerance are distinct from the optimized 230- or 253-core designs. No tolerance is transferred between them.'
dump('cooperative_reference.json',reference)
optimal=[]
for rho,ly in COOPERATIVE_TARGETS:
w=frontier(F(rho),q=QUOTA,ly_min=ly,cap=COOPERATIVE_SEARCH_CAP);w.pop('seconds',None)
g=CooperativeGate(Corridor(w['lx'],w['ux'],w['gx']),Corridor(w['ly'],w['uy'],w['gy']),QUOTA,F(GATE_FORWARD_FLOOR),F(GATE_REVERSE_CEILING))
w['realized_gate']=report_gate(g)
w['configured_clock_meets_target']=g.joint_lower()>F(rho)
optimal.append(w);print('Cooperative class',rho,'minority floor',ly,'minimum core',w['N'],flush=True)
dump('cooperative_frontiers.json',optimal)
scaling=[]
for power in range(2,8):
w=frontier(1-F(1,10**power),q=QUOTA,cap=COOPERATIVE_SEARCH_CAP);w.pop('seconds',None)
scaling.append(dict(failure_target=str(F(1,10**power)),core=w['N'],molecularity=w['lx']+w['ly']+w['gx']+w['gy']+QUOTA+1,core_over_log_failure=w['N']/log(10**power)))
table('cooperative_scaling.csv',scaling)
w=dict(lx=ref.majority.low,ux=ref.majority.high,gx=ref.majority.growth,ly=ref.minority.low,uy=ref.minority.high,gy=ref.minority.growth,q=QUOTA)
dump('cooperative_rate_spread.json',spread(w,ref.core,log10_k(w['lx'],w['ly'],ref.food_consumed,float(ref.forward_floor))))
cases=[(l,u,g) for l in range(1,9) for u in range(l,25) for g in range(l,u+1)]
dump('endpoint_reduction_replay.json',dict(cases=len(cases),violations=verify_endpoint_lemma(cases)))
plot(out,nominal,untied,diagnostics,scaling)
print('Joint quota/allocation certificates regenerated; full finite generator used. Floating diagnostics and one sampled lineage are not guarantees.',flush=True)
print('Support rate box has five independent groups with tied exits. Cooperative gates permit extreme reaction order/rates; counts are not energy costs. Lean not rerun.',flush=True)
here=Path(__file__).parent;digest=lambda p:hashlib.sha256(p.read_bytes()).hexdigest()
dump('run_metadata.json',dict(manuscript_sha256=MANUSCRIPT_SHA256,source_sha256=digest(Path(__file__)),python=platform.python_version(),numpy=np.__version__,scipy=scipy.__version__,
module_sha256={p.name:digest(p) for p in sorted(here.glob('*.py')) if p.name not in ['example.py','test_example.py']},
input_sha256={p.name:digest(p) for p in sorted(here.glob('*.json')) if p.name!='release.json'},
output_sha256={p.name:digest(p) for p in sorted(out.iterdir()) if p.is_file() and p.name!='run_metadata.json'}))
def plot(out,nominal,untied,diagnostics,scaling):
import matplotlib
matplotlib.use('Agg')
import matplotlib.pyplot as plt
fig,axs=plt.subplots(1,2,figsize=(11,4),layout='constrained')
for rows,label in [(nominal,'Balanced exits'),(untied,'Dissociation favored')]:
axs[0].semilogy([r['K'] for r in rows],[1-r['upper']/SCALE for r in rows],'.-',label=label+' (lower failure)')
axs[0].semilogy([r['K'] for r in rows],[1-r['lower']/SCALE for r in rows],':',alpha=.7)
axs[0].axhline(1-float(F(SUPPORT_TARGET)),color='black',ls='--');axs[0].set(xlabel='Working inventory K',ylabel='Worst-start failure probability',title='Certified failure bounds versus working\ninventory');axs[0].legend(fontsize=7)
x=np.arange(len(diagnostics));axs[1].bar(x,[r['quota_failure'] for r in diagnostics],label='Quota missed');axs[1].bar(x,[r['allocation_failure_after_quota'] for r in diagnostics],bottom=[r['quota_failure'] for r in diagnostics],label='Quota met, daughter lost');axs[1].set(xticks=x,xticklabels=['20/10\nresident','20/10\nseed','10/10\nresident','10/10\nseed','10/20\nresident','10/20\nseed'],ylabel='Failure probability',title='Quota and daughter-allocation failures by\nreaction rates');axs[1].legend(fontsize=8)
for a in axs:a.grid(alpha=.2)
fig.savefig(out/'support_frontier_and_failure.png',dpi=180);fig.savefig(out/'support_frontier_and_failure.svg');plt.close(fig)
fig,axs=plt.subplots(1,2,figsize=(10,4),layout='constrained')
axs[0].bar(['Support\nbenchmark','Cooperative\nclass'],[32,231],color=['#537ba7','#bf8646']);axs[0].set(ylabel='Initial supplied units, including token',title='Quota 4, reliability 0.999');axs[0].text(.5,245,'Different architectural scopes',ha='center',fontsize=9);axs[0].set_ylim(0,280)
x=[log(1/float(F(r['failure_target']))) for r in scaling];axs[1].plot(x,[r['core'] for r in scaling],'o-',label='Exact class frontier');axs[1].plot(x,[33.3*v for v in x],':',label='33.3 log(1 / failure): empirical');axs[1].set(xlabel='log(1 / failure target)',ylabel='Minimum core inventory',title='Minimum core inventory versus reliability\ntarget');axs[1].legend(fontsize=8)
for a in axs:a.grid(alpha=.2)
fig.savefig(out/'cooperative_material_cost.png',dpi=180);fig.savefig(out/'cooperative_material_cost.svg');plt.close(fig)
if __name__=='__main__': main()
Run output
Configured support band: certified 2145514420 / 2147483648 Fresh budget 15 untied: excluded Fresh budget 16 untied: excluded Fresh budget 17 untied: excluded Fresh budget 18 untied: excluded Fresh budget 19 untied: excluded Fresh budget 20 untied: excluded Fresh budget 21 untied: excluded Fresh budget 22 untied: excluded Fresh budget 23 untied: excluded Fresh budget 24 untied: excluded Fresh budget 25 untied: excluded Fresh budget 26 untied: excluded Fresh budget 27 untied: excluded Fresh budget 28 untied: excluded Fresh budget 29 untied: excluded Fresh budget 30 untied: excluded Fresh budget 31 untied: excluded Fresh budget 32 untied: excluded Fresh budget 33 untied: excluded Fresh budget 34 untied: excluded Fresh budget 35 untied: excluded Fresh budget 36 untied: excluded Fresh budget 37 untied: excluded Fresh budget 38 untied: excluded Fresh budget 39 untied: excluded Fresh budget 40 untied: excluded Fresh budget 41 untied: excluded Fresh budget 42 untied: certified nominal minimum 32 untied minimum 42 Cooperative class 999/1000 minority floor 1 minimum core 230 Cooperative class 1999/2000 minority floor 1 minimum core 253 Cooperative class 1999/2000 minority floor 8 minimum core 375 Joint quota/allocation certificates regenerated; full finite generator used. Floating diagnostics and one sampled lineage are not guarantees. Support rate box has five independent groups with tied exits. Cooperative gates permit extreme reaction order/rates; counts are not energy costs. Lean not rerun.