| ⊦ ( (ctrok(gs.ctr, gs.writers) ∧ writersOk(gs.p, gs.writers) ∧ pendingOk(gs.p)) ∧ notMember(ls.t, gs.readers) ∧ oneMember(ls.t, ls.l, gs.writers) ∧ noPending(ls.t, gs.p)) ∧ pre(gs, ls, W6, a) ∧ pcstepf(gs, ls, W6, a) = W7 → ( ctrok(gstepf(gs, ls, W6, a).ctr, gstepf(gs, ls, W6, a).writers) ∧ writersOk(gstepf(gs, ls, W6, a).p, gstepf(gs, ls, W6, a).writers) ∧ pendingOk(gstepf(gs, ls, W6, a).p)) ∧ notMember(lstepf(gs, ls, W6, a).t, gstepf(gs, ls, W6, a).readers) ∧ notMember(lstepf(gs, ls, W6, a).t, gstepf(gs, ls, W6, a).writers) ∧ noPending(lstepf(gs, ls, W6, a).t, gstepf(gs, ls, W6, a).p) |