TSTP Solution File: GRP298-1 by SPASS---3.9

View Problem - Process Solution

%------------------------------------------------------------------------------
% File     : SPASS---3.9
% Problem  : GRP298-1 : TPTP v8.1.0. Released v2.5.0.
% Transfm  : none
% Format   : tptp
% Command  : run_spass %d %s

% Computer : n028.cluster.edu
% Model    : x86_64 x86_64
% CPU      : Intel(R) Xeon(R) CPU E5-2620 v4 2.10GHz
% Memory   : 8042.1875MB
% OS       : Linux 3.10.0-693.el7.x86_64
% CPULimit : 300s
% WCLimit  : 600s
% DateTime : Sat Jul 16 11:46:44 EDT 2022

% Result   : Unsatisfiable 0.18s 0.43s
% Output   : Refutation 0.18s
% Verified : 
% SZS Type : -

% Comments : 
%------------------------------------------------------------------------------
%----WARNING: Could not form TPTP format derivation
%------------------------------------------------------------------------------
%----ORIGINAL SYSTEM OUTPUT
% 0.03/0.12  % Problem  : GRP298-1 : TPTP v8.1.0. Released v2.5.0.
% 0.03/0.12  % Command  : run_spass %d %s
% 0.12/0.33  % Computer : n028.cluster.edu
% 0.12/0.33  % Model    : x86_64 x86_64
% 0.12/0.33  % CPU      : Intel(R) Xeon(R) CPU E5-2620 v4 @ 2.10GHz
% 0.12/0.33  % Memory   : 8042.1875MB
% 0.12/0.33  % OS       : Linux 3.10.0-693.el7.x86_64
% 0.12/0.33  % CPULimit : 300
% 0.12/0.33  % WCLimit  : 600
% 0.12/0.33  % DateTime : Tue Jun 14 05:09:08 EDT 2022
% 0.12/0.34  % CPUTime  : 
% 0.18/0.43  
% 0.18/0.43  SPASS V 3.9 
% 0.18/0.43  SPASS beiseite: Proof found.
% 0.18/0.43  % SZS status Theorem
% 0.18/0.43  Problem: /export/starexec/sandbox2/benchmark/theBenchmark.p 
% 0.18/0.43  SPASS derived 345 clauses, backtracked 178 clauses, performed 9 splits and kept 350 clauses.
% 0.18/0.43  SPASS allocated 63344 KBytes.
% 0.18/0.43  SPASS spent	0:00:00.09 on the problem.
% 0.18/0.43  		0:00:00.03 for the input.
% 0.18/0.43  		0:00:00.00 for the FLOTTER CNF translation.
% 0.18/0.43  		0:00:00.00 for inferences.
% 0.18/0.43  		0:00:00.00 for the backtracking.
% 0.18/0.43  		0:00:00.03 for the reduction.
% 0.18/0.43  
% 0.18/0.43  
% 0.18/0.43  Here is a proof with depth 4, length 145 :
% 0.18/0.43  % SZS output start Refutation
% 0.18/0.43  1[0:Inp] ||  -> equal(multiply(sk_c2,sk_c8),sk_c7)** equal(multiply(sk_c8,sk_c7),sk_c6).
% 0.18/0.43  2[0:Inp] ||  -> equal(inverse(sk_c2),sk_c8) equal(multiply(sk_c8,sk_c7),sk_c6)**.
% 0.18/0.43  3[0:Inp] ||  -> equal(multiply(sk_c8,sk_c6),sk_c7)** equal(multiply(sk_c8,sk_c7),sk_c6).
% 0.18/0.43  4[0:Inp] ||  -> equal(inverse(sk_c3),sk_c8) equal(multiply(sk_c8,sk_c7),sk_c6)**.
% 0.18/0.43  5[0:Inp] ||  -> equal(multiply(sk_c3,sk_c7),sk_c8)** equal(multiply(sk_c8,sk_c7),sk_c6).
% 0.18/0.43  6[0:Inp] ||  -> equal(multiply(sk_c4,sk_c5),sk_c7)** equal(multiply(sk_c8,sk_c7),sk_c6).
% 0.18/0.43  7[0:Inp] ||  -> equal(inverse(sk_c4),sk_c5) equal(multiply(sk_c8,sk_c7),sk_c6)**.
% 0.18/0.43  9[0:Inp] ||  -> equal(multiply(sk_c2,sk_c8),sk_c7) equal(multiply(sk_c1,sk_c8),sk_c7)**.
% 0.18/0.43  10[0:Inp] ||  -> equal(inverse(sk_c2),sk_c8) equal(multiply(sk_c1,sk_c8),sk_c7)**.
% 0.18/0.43  11[0:Inp] ||  -> equal(multiply(sk_c8,sk_c6),sk_c7) equal(multiply(sk_c1,sk_c8),sk_c7)**.
% 0.18/0.43  17[0:Inp] ||  -> equal(inverse(sk_c1),sk_c8) equal(multiply(sk_c2,sk_c8),sk_c7)**.
% 0.18/0.43  18[0:Inp] ||  -> equal(inverse(sk_c2),sk_c8) equal(inverse(sk_c1),sk_c8)**.
% 0.18/0.43  19[0:Inp] ||  -> equal(inverse(sk_c1),sk_c8) equal(multiply(sk_c8,sk_c6),sk_c7)**.
% 0.18/0.43  25[0:Inp] ||  -> equal(multiply(sk_c2,sk_c8),sk_c7)** equal(multiply(sk_c6,sk_c8),sk_c7).
% 0.18/0.43  26[0:Inp] ||  -> equal(inverse(sk_c2),sk_c8) equal(multiply(sk_c6,sk_c8),sk_c7)**.
% 0.18/0.43  27[0:Inp] ||  -> equal(multiply(sk_c8,sk_c6),sk_c7) equal(multiply(sk_c6,sk_c8),sk_c7)**.
% 0.18/0.43  28[0:Inp] ||  -> equal(inverse(sk_c3),sk_c8) equal(multiply(sk_c6,sk_c8),sk_c7)**.
% 0.18/0.43  29[0:Inp] ||  -> equal(multiply(sk_c3,sk_c7),sk_c8)** equal(multiply(sk_c6,sk_c8),sk_c7).
% 0.18/0.43  33[0:Inp] || equal(multiply(sk_c8,sk_c7),sk_c6) equal(multiply(u,sk_c8),sk_c7)** equal(inverse(u),sk_c8) equal(multiply(sk_c6,sk_c8),sk_c7)** equal(multiply(v,sk_c8),sk_c7)** equal(inverse(v),sk_c8) equal(multiply(sk_c8,sk_c6),sk_c7) equal(inverse(w),sk_c8) equal(multiply(w,sk_c7),sk_c8)** equal(multiply(x,y),sk_c7)** equal(inverse(x),y) equal(multiply(y,sk_c6),sk_c7)** -> .
% 0.18/0.43  34[0:Inp] ||  -> equal(multiply(identity,u),u)**.
% 0.18/0.43  35[0:Inp] ||  -> equal(multiply(inverse(u),u),identity)**.
% 0.18/0.43  36[0:Inp] ||  -> equal(multiply(multiply(u,v),w),multiply(u,multiply(v,w)))**.
% 0.18/0.43  37[0:Con:33.4] || equal(inverse(u),sk_c8) equal(inverse(v),sk_c8) equal(multiply(u,sk_c7),sk_c8)**+ equal(multiply(v,sk_c8),sk_c7)** equal(multiply(sk_c8,sk_c6),sk_c7) equal(multiply(sk_c6,sk_c8),sk_c7)** equal(multiply(sk_c8,sk_c7),sk_c6) -> .
% 0.18/0.43  38[1:Spt:37.1,37.3] || equal(inverse(u),sk_c8) equal(multiply(u,sk_c8),sk_c7)** -> .
% 0.18/0.43  45[2:Spt:19.0] ||  -> equal(inverse(sk_c1),sk_c8)**.
% 0.18/0.43  47[3:Spt:11.1] ||  -> equal(multiply(sk_c1,sk_c8),sk_c7)**.
% 0.18/0.43  49[3:SpL:47.0,38.1] || equal(inverse(sk_c1),sk_c8)** equal(sk_c7,sk_c7) -> .
% 0.18/0.43  50[3:Obv:49.1] || equal(inverse(sk_c1),sk_c8)** -> .
% 0.18/0.43  51[3:Rew:45.0,50.0] || equal(sk_c8,sk_c8)* -> .
% 0.18/0.43  52[3:Obv:51.0] ||  -> .
% 0.18/0.43  53[3:Spt:52.0,11.1,47.0] || equal(multiply(sk_c1,sk_c8),sk_c7)** -> .
% 0.18/0.43  54[3:Spt:52.0,11.0] ||  -> equal(multiply(sk_c8,sk_c6),sk_c7)**.
% 0.18/0.43  57[3:MRR:10.1,53.0] ||  -> equal(inverse(sk_c2),sk_c8)**.
% 0.18/0.43  61[3:MRR:9.1,53.0] ||  -> equal(multiply(sk_c2,sk_c8),sk_c7)**.
% 0.18/0.43  70[3:SpL:61.0,38.1] || equal(inverse(sk_c2),sk_c8)** equal(sk_c7,sk_c7) -> .
% 0.18/0.43  71[3:Obv:70.1] || equal(inverse(sk_c2),sk_c8)** -> .
% 0.18/0.43  72[3:Rew:57.0,71.0] || equal(sk_c8,sk_c8)* -> .
% 0.18/0.43  73[3:Obv:72.0] ||  -> .
% 0.18/0.43  74[2:Spt:73.0,19.0,45.0] || equal(inverse(sk_c1),sk_c8)** -> .
% 0.18/0.43  75[2:Spt:73.0,19.1] ||  -> equal(multiply(sk_c8,sk_c6),sk_c7)**.
% 0.18/0.43  78[2:MRR:18.1,74.0] ||  -> equal(inverse(sk_c2),sk_c8)**.
% 0.18/0.43  82[2:MRR:17.0,74.0] ||  -> equal(multiply(sk_c2,sk_c8),sk_c7)**.
% 0.18/0.43  91[2:SpL:82.0,38.1] || equal(inverse(sk_c2),sk_c8)** equal(sk_c7,sk_c7) -> .
% 0.18/0.43  92[2:Obv:91.1] || equal(inverse(sk_c2),sk_c8)** -> .
% 0.18/0.43  93[2:Rew:78.0,92.0] || equal(sk_c8,sk_c8)* -> .
% 0.18/0.43  94[2:Obv:93.0] ||  -> .
% 0.18/0.43  95[1:Spt:94.0,37.0,37.2,37.4,37.5,37.6] || equal(inverse(u),sk_c8) equal(multiply(u,sk_c7),sk_c8)**+ equal(multiply(sk_c8,sk_c6),sk_c7) equal(multiply(sk_c6,sk_c8),sk_c7)** equal(multiply(sk_c8,sk_c7),sk_c6) -> .
% 0.18/0.43  96[2:Spt:3.1] ||  -> equal(multiply(sk_c8,sk_c7),sk_c6)**.
% 0.18/0.43  97[2:Rew:96.0,95.4] || equal(inverse(u),sk_c8) equal(multiply(u,sk_c7),sk_c8)** equal(multiply(sk_c8,sk_c6),sk_c7) equal(multiply(sk_c6,sk_c8),sk_c7)** equal(sk_c6,sk_c6) -> .
% 0.18/0.43  98[2:Obv:97.4] || equal(inverse(u),sk_c8) equal(multiply(u,sk_c7),sk_c8)** equal(multiply(sk_c8,sk_c6),sk_c7) equal(multiply(sk_c6,sk_c8),sk_c7)** -> .
% 0.18/0.43  100[3:Spt:27.1] ||  -> equal(multiply(sk_c6,sk_c8),sk_c7)**.
% 0.18/0.43  101[3:Rew:100.0,98.3] || equal(inverse(u),sk_c8) equal(multiply(u,sk_c7),sk_c8)** equal(multiply(sk_c8,sk_c6),sk_c7)** equal(sk_c7,sk_c7) -> .
% 0.18/0.43  102[3:Obv:101.3] || equal(inverse(u),sk_c8) equal(multiply(u,sk_c7),sk_c8)** equal(multiply(sk_c8,sk_c6),sk_c7)** -> .
% 0.18/0.43  104[4:Spt:19.0] ||  -> equal(inverse(sk_c1),sk_c8)**.
% 0.18/0.43  106[5:Spt:11.1] ||  -> equal(multiply(sk_c1,sk_c8),sk_c7)**.
% 0.18/0.43  110[4:SpR:104.0,35.0] ||  -> equal(multiply(sk_c8,sk_c1),identity)**.
% 0.18/0.43  115[4:SpR:110.0,36.0] ||  -> equal(multiply(sk_c8,multiply(sk_c1,u)),multiply(identity,u))**.
% 0.18/0.43  119[0:SpR:35.0,36.0] ||  -> equal(multiply(inverse(u),multiply(u,v)),multiply(identity,v))**.
% 0.18/0.43  120[4:Rew:34.0,115.0] ||  -> equal(multiply(sk_c8,multiply(sk_c1,u)),u)**.
% 0.18/0.43  121[0:Rew:34.0,119.0] ||  -> equal(multiply(inverse(u),multiply(u,v)),v)**.
% 0.18/0.43  125[5:SpR:106.0,120.0] ||  -> equal(multiply(sk_c8,sk_c7),sk_c8)**.
% 0.18/0.43  126[5:Rew:96.0,125.0] ||  -> equal(sk_c6,sk_c8)**.
% 0.18/0.43  127[5:Rew:126.0,96.0] ||  -> equal(multiply(sk_c8,sk_c7),sk_c8)**.
% 0.18/0.43  128[5:Rew:126.0,100.0] ||  -> equal(multiply(sk_c8,sk_c8),sk_c7)**.
% 0.18/0.43  129[5:Rew:126.0,102.2] || equal(inverse(u),sk_c8) equal(multiply(u,sk_c7),sk_c8)** equal(multiply(sk_c8,sk_c8),sk_c7)** -> .
% 0.18/0.43  133[5:Rew:128.0,129.2] || equal(inverse(u),sk_c8) equal(multiply(u,sk_c7),sk_c8)** equal(sk_c7,sk_c7) -> .
% 0.18/0.43  134[5:Obv:133.2] || equal(inverse(u),sk_c8) equal(multiply(u,sk_c7),sk_c8)** -> .
% 0.18/0.43  141[0:SpR:121.0,121.0] ||  -> equal(multiply(inverse(inverse(u)),v),multiply(u,v))**.
% 0.18/0.43  143[4:SpR:110.0,121.0] ||  -> equal(multiply(inverse(sk_c8),identity),sk_c1)**.
% 0.18/0.43  145[5:SpR:127.0,121.0] ||  -> equal(multiply(inverse(sk_c8),sk_c8),sk_c7)**.
% 0.18/0.43  146[5:SpR:128.0,121.0] ||  -> equal(multiply(inverse(sk_c8),sk_c7),sk_c8)**.
% 0.18/0.43  149[0:SpR:35.0,121.0] ||  -> equal(multiply(inverse(inverse(u)),identity),u)**.
% 0.18/0.43  152[5:Rew:35.0,145.0] ||  -> equal(identity,sk_c7)**.
% 0.18/0.43  156[5:Rew:152.0,143.0] ||  -> equal(multiply(inverse(sk_c8),sk_c7),sk_c1)**.
% 0.18/0.43  162[5:Rew:146.0,156.0] ||  -> equal(sk_c1,sk_c8)**.
% 0.18/0.43  163[5:Rew:162.0,104.0] ||  -> equal(inverse(sk_c8),sk_c8)**.
% 0.18/0.43  168[5:Rew:152.0,149.0] ||  -> equal(multiply(inverse(inverse(u)),sk_c7),u)**.
% 0.18/0.43  172[5:Rew:141.0,168.0] ||  -> equal(multiply(u,sk_c7),u)**.
% 0.18/0.43  173[5:Rew:172.0,134.1] || equal(inverse(u),sk_c8)** equal(u,sk_c8) -> .
% 0.18/0.43  209[5:SpL:163.0,173.0] || equal(sk_c8,sk_c8)* equal(sk_c8,sk_c8)* -> .
% 0.18/0.43  211[5:Obv:209.1] ||  -> .
% 0.18/0.43  213[5:Spt:211.0,11.1,106.0] || equal(multiply(sk_c1,sk_c8),sk_c7)** -> .
% 0.18/0.43  214[5:Spt:211.0,11.0] ||  -> equal(multiply(sk_c8,sk_c6),sk_c7)**.
% 0.18/0.43  215[0:Rew:141.0,149.0] ||  -> equal(multiply(u,identity),u)**.
% 0.18/0.43  216[4:Rew:215.0,143.0] ||  -> equal(inverse(sk_c8),sk_c1)**.
% 0.18/0.43  220[5:MRR:10.1,213.0] ||  -> equal(inverse(sk_c2),sk_c8)**.
% 0.18/0.43  224[5:MRR:9.1,213.0] ||  -> equal(multiply(sk_c2,sk_c8),sk_c7)**.
% 0.18/0.43  245[3:SpR:100.0,121.0] ||  -> equal(multiply(inverse(sk_c6),sk_c7),sk_c8)**.
% 0.18/0.43  248[2:SpR:96.0,121.0] ||  -> equal(multiply(inverse(sk_c8),sk_c6),sk_c7)**.
% 0.18/0.43  250[4:Rew:216.0,248.0] ||  -> equal(multiply(sk_c1,sk_c6),sk_c7)**.
% 0.18/0.43  265[5:SpR:224.0,121.0] ||  -> equal(multiply(inverse(sk_c2),sk_c7),sk_c8)**.
% 0.18/0.43  267[5:Rew:96.0,265.0,220.0,265.0] ||  -> equal(sk_c6,sk_c8)**.
% 0.18/0.43  279[5:Rew:267.0,250.0] ||  -> equal(multiply(sk_c1,sk_c8),sk_c7)**.
% 0.18/0.43  280[5:MRR:279.0,213.0] ||  -> .
% 0.18/0.43  282[4:Spt:280.0,19.0,104.0] || equal(inverse(sk_c1),sk_c8)** -> .
% 0.18/0.43  283[4:Spt:280.0,19.1] ||  -> equal(multiply(sk_c8,sk_c6),sk_c7)**.
% 0.18/0.43  286[4:MRR:18.1,282.0] ||  -> equal(inverse(sk_c2),sk_c8)**.
% 0.18/0.44  290[4:MRR:17.0,282.0] ||  -> equal(multiply(sk_c2,sk_c8),sk_c7)**.
% 0.18/0.44  291[4:Rew:283.0,102.2] || equal(inverse(u),sk_c8) equal(multiply(u,sk_c7),sk_c8)** equal(sk_c7,sk_c7) -> .
% 0.18/0.44  292[4:Obv:291.2] || equal(inverse(u),sk_c8) equal(multiply(u,sk_c7),sk_c8)** -> .
% 0.18/0.44  320[4:SpR:290.0,121.0] ||  -> equal(multiply(inverse(sk_c2),sk_c7),sk_c8)**.
% 0.18/0.44  322[4:Rew:96.0,320.0,286.0,320.0] ||  -> equal(sk_c6,sk_c8)**.
% 0.18/0.44  327[4:Rew:322.0,245.0] ||  -> equal(multiply(inverse(sk_c8),sk_c7),sk_c8)**.
% 0.18/0.44  328[4:Rew:322.0,248.0] ||  -> equal(multiply(inverse(sk_c8),sk_c8),sk_c7)**.
% 0.18/0.44  335[4:Rew:35.0,328.0] ||  -> equal(identity,sk_c7)**.
% 0.18/0.44  339[4:Rew:335.0,215.0] ||  -> equal(multiply(u,sk_c7),u)**.
% 0.18/0.44  343[4:Rew:339.0,327.0] ||  -> equal(inverse(sk_c8),sk_c8)**.
% 0.18/0.44  344[4:Rew:339.0,292.1] || equal(inverse(u),sk_c8)** equal(u,sk_c8) -> .
% 0.18/0.44  420[4:SpL:343.0,344.0] || equal(sk_c8,sk_c8)* equal(sk_c8,sk_c8)* -> .
% 0.18/0.44  421[4:Obv:420.1] ||  -> .
% 0.18/0.44  422[3:Spt:421.0,27.1,100.0] || equal(multiply(sk_c6,sk_c8),sk_c7)** -> .
% 0.18/0.44  423[3:Spt:421.0,27.0] ||  -> equal(multiply(sk_c8,sk_c6),sk_c7)**.
% 0.18/0.44  425[3:MRR:28.1,422.0] ||  -> equal(inverse(sk_c3),sk_c8)**.
% 0.18/0.44  426[3:MRR:26.1,422.0] ||  -> equal(inverse(sk_c2),sk_c8)**.
% 0.18/0.44  429[3:MRR:29.1,422.0] ||  -> equal(multiply(sk_c3,sk_c7),sk_c8)**.
% 0.18/0.44  430[3:MRR:25.1,422.0] ||  -> equal(multiply(sk_c2,sk_c8),sk_c7)**.
% 0.18/0.44  451[3:SpR:429.0,121.0] ||  -> equal(multiply(inverse(sk_c3),sk_c8),sk_c7)**.
% 0.18/0.44  453[3:Rew:425.0,451.0] ||  -> equal(multiply(sk_c8,sk_c8),sk_c7)**.
% 0.18/0.44  455[3:SpR:430.0,121.0] ||  -> equal(multiply(inverse(sk_c2),sk_c7),sk_c8)**.
% 0.18/0.44  457[3:Rew:96.0,455.0,426.0,455.0] ||  -> equal(sk_c6,sk_c8)**.
% 0.18/0.44  462[3:Rew:457.0,422.0] || equal(multiply(sk_c8,sk_c8),sk_c7)** -> .
% 0.18/0.44  478[3:Rew:453.0,462.0] || equal(sk_c7,sk_c7)* -> .
% 0.18/0.44  479[3:Obv:478.0] ||  -> .
% 0.18/0.44  487[2:Spt:479.0,3.1,96.0] || equal(multiply(sk_c8,sk_c7),sk_c6)** -> .
% 0.18/0.44  488[2:Spt:479.0,3.0] ||  -> equal(multiply(sk_c8,sk_c6),sk_c7)**.
% 0.18/0.44  489[2:MRR:7.1,487.0] ||  -> equal(inverse(sk_c4),sk_c5)**.
% 0.18/0.44  490[2:MRR:4.1,487.0] ||  -> equal(inverse(sk_c3),sk_c8)**.
% 0.18/0.44  491[2:MRR:2.1,487.0] ||  -> equal(inverse(sk_c2),sk_c8)**.
% 0.18/0.44  493[2:MRR:6.1,487.0] ||  -> equal(multiply(sk_c4,sk_c5),sk_c7)**.
% 0.18/0.44  494[2:MRR:5.1,487.0] ||  -> equal(multiply(sk_c3,sk_c7),sk_c8)**.
% 0.18/0.44  495[2:MRR:1.1,487.0] ||  -> equal(multiply(sk_c2,sk_c8),sk_c7)**.
% 0.18/0.44  497[2:SpR:488.0,121.0] ||  -> equal(multiply(inverse(sk_c8),sk_c7),sk_c6)**.
% 0.18/0.44  509[2:SpR:493.0,121.0] ||  -> equal(multiply(inverse(sk_c4),sk_c7),sk_c5)**.
% 0.18/0.44  511[2:Rew:489.0,509.0] ||  -> equal(multiply(sk_c5,sk_c7),sk_c5)**.
% 0.18/0.44  517[2:SpR:495.0,121.0] ||  -> equal(multiply(inverse(sk_c2),sk_c7),sk_c8)**.
% 0.18/0.44  519[2:Rew:491.0,517.0] ||  -> equal(multiply(sk_c8,sk_c7),sk_c8)**.
% 0.18/0.44  520[2:Rew:519.0,487.0] || equal(sk_c6,sk_c8)** -> .
% 0.18/0.44  522[2:SpR:511.0,121.0] ||  -> equal(multiply(inverse(sk_c5),sk_c5),sk_c7)**.
% 0.18/0.44  524[2:Rew:35.0,522.0] ||  -> equal(identity,sk_c7)**.
% 0.18/0.44  526[2:Rew:524.0,215.0] ||  -> equal(multiply(u,sk_c7),u)**.
% 0.18/0.44  534[2:Rew:526.0,494.0] ||  -> equal(sk_c3,sk_c8)**.
% 0.18/0.44  536[2:Rew:526.0,497.0] ||  -> equal(inverse(sk_c8),sk_c6)**.
% 0.18/0.44  537[2:Rew:534.0,490.0] ||  -> equal(inverse(sk_c8),sk_c8)**.
% 0.18/0.44  539[2:Rew:536.0,537.0] ||  -> equal(sk_c6,sk_c8)**.
% 0.18/0.44  540[2:MRR:539.0,520.0] ||  -> .
% 0.18/0.44  % SZS output end Refutation
% 0.18/0.44  Formulae used in the proof : prove_this_1 prove_this_2 prove_this_3 prove_this_4 prove_this_5 prove_this_6 prove_this_7 prove_this_9 prove_this_10 prove_this_11 prove_this_17 prove_this_18 prove_this_19 prove_this_25 prove_this_26 prove_this_27 prove_this_28 prove_this_29 prove_this_33 left_identity left_inverse associativity
% 0.18/0.44  
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