kenzo/archive/Kenzo-2/Kenzo-2-Acl5/macros.cl
2017-02-20 07:38:35 -06:00

817 lines
17 KiB
Common Lisp

;;; MACROS MACROS MACROS MACROS MACROS MACROS MACROS
;;; MACROS MACROS MACROS MACROS MACROS MACROS MACROS
;;; MACROS MACROS MACROS MACROS MACROS MACROS MACROS
(IN-PACKAGE "CAT")
(PROVIDE "macros")
;;;
;;; VARIOUS
;;;
(DEFMACRO -1-EXPT-N (n)
`(the fixnum (if (evenp (the fixnum ,n)) 1 -1)))
(DEFMACRO -1-EXPT-N+1 (n)
`(the fixnum (if (evenp (the fixnum ,n)) -1 1)))
(DEFMACRO -1-EXPT-N-1 (n)
`(-1-expt-n+1 ,n))
#|
(-1-expt-n 5)
(-1-expt-n 6)
(-1-expt-n+1 5)
(-1-expt-n+1 6)
(-1-expt-n-1 5)
(-1-expt-n-1 6))
|#
;;; (DEFCONSTANT +2-EXP+ (make-array (integer-length most-positive-fixnum)
;;; :element-type 'fixnum))
;;;
;;; (dotimes (i (integer-length most-positive-fixnum))
;;; (setf (aref +2-exp+ i) (the fixnum (expt 2 i))))
(DEFCONSTANT +2-EXP+
(let ((rslt (make-array (integer-length most-positive-fixnum)
:element-type 'fixnum)))
(declare (type (array fixnum 1) rslt))
(dotimes (i (integer-length most-positive-fixnum) rslt)
(setf (aref rslt i) (the fixnum (expt 2 i))))))
(DEFMACRO 2-EXP (n)
`(aref +2-exp+ ,n))
;;; (DEFCONSTANT +MASK+ (make-array (1+ (integer-length most-positive-fixnum))
;;; :element-type 'fixnum))
;;;
;;; (dotimes (i (1+ (integer-length most-positive-fixnum)))
;;; (setf (aref +mask+ i) (the fixnum (1- (expt 2 i)))))
(DEFCONSTANT +MASK+
(let ((rslt (make-array (integer-length most-positive-fixnum)
:element-type 'fixnum)))
(declare (type (array fixnum 1) rslt))
(dotimes (i (integer-length most-positive-fixnum) rslt)
(setf (aref rslt i) (the fixnum (1- (expt 2 i)))))))
(DEFMACRO MASK (n)
`(aref +mask+ ,n))
(DEFMACRO BINOMIAL-P-Q (p q)
`(binomial-n-p (+ ,p ,q) ,p))
;;;
;;; COMBINATIONS
;;;
(DEFMACRO LEXICO (&rest rest)
(unless (cdr rest)
(return-from lexico (first rest)))
(let ((vrslt (gensym)))
`(let ((,vrslt ,(first rest)))
(declare (type cmpr ,vrslt))
(if (eq ,vrslt :equal)
(lexico ,@(rest rest))
,vrslt))))
#|
(let ((#+ACLPC allegro:*top-print-level*
#-ACLPC *print-level* nil))
(declare (special
#+aclpc allegro:*top-print-level*
#-aclpc *print-level*))
(pprint (macroexpand-1
'(lexico
comparison1
comparison2
comparison3
comparison4)))))
|#
(DEFMACRO TERM (cffc gnrt)
`(cons ,cffc ,gnrt))
(DEFMACRO -TERM (mark)
`(car ,mark))
(DEFMACRO CFFC (term)
`(car ,term))
(DEFMACRO -CFFC (mark)
`(caar ,mark))
(DEFMACRO GNRT (term)
`(cdr ,term))
(DEFMACRO -GNRT (mark)
`(cdar ,mark))
(DEFMACRO WITH-TERM ((cffc gnrt) term . body)
`(let (,@(if cffc `((,cffc (cffc ,term))) nil)
,@(if gnrt `((,gnrt (gnrt ,term))) nil))
(declare
(fixnum ,@(if cffc `(,cffc) nil))
(type gnrt ,@(if gnrt `(,gnrt) nil)))
,@body))
#|
(macroexpand-1 '(with-term (cffc gnrt) term
(statement-1)
(statement-2)))
(macroexpand-1 '(with-term (nil gnrt) term
(statement-1)
(statement-2)))
|#
(DEFMACRO WITH--TERM ((cffc gnrt) mark . body)
`(let ((,cffc (-cffc ,mark))
(,gnrt (-gnrt ,mark)))
(declare
(fixnum ,cffc)
(type gnrt ,gnrt))
,@body))
#|
(macroexpand-1 '(with--term (cffc gnrt) mark
(statement-1)
(statement-2)))
|#
(DEFMACRO MAKE-CMBN (&key degr list)
`(cons :cmbn
(cons ,degr ,list)))
#|
(make-cmbn :degr 3 :list '((1 . a) (2 . b)))
|#
(DEFMACRO CMBN-DEGR (cmbn)
`(cadr ,cmbn))
(DEFMACRO CMBN-LIST (cmbn)
`(cddr ,cmbn))
#|
(cmbn-degr (cons :cmbn (cons 5 nil)))
(cmbn-list (cons :cmbn (cons 5 nil)))
|#
(DEFMACRO WITH-CMBN ((degr list) cmbn . body)
`(let ((,degr (cmbn-degr ,cmbn))
(,list (cmbn-list ,cmbn)))
(declare
(fixnum ,degr)
(list ,list))
,@body))
#|
(macroexpand-1 '(with-cmbn (degr list) cmbn
(statement-1)
(statement-2)))
|#
(DEFMACRO TERM-CMBN (degr cffc gnrt)
`(cons :cmbn (cons ,degr (cons (cons ,cffc ,gnrt) nil))))
(DEFMACRO CMBN-NON-ZERO-P (cmbn)
`(cmbn-list ,cmbn))
(DEFMACRO CMBN-ZERO-P (cmbn)
`(null (cmbn-list ,cmbn)))
;;;
;;; CHAIN COMPLEXES
;;;
(DEFMACRO CMPR (&rest rest)
(ecase (length rest)
(1 `(cmpr1 ,@rest))
(3 `(cmpr3 ,@rest))))
(DEFMACRO CMPR3 (object item1 item2)
`(funcall (cmpr1 ,object) ,item1 ,item2))
#|
(macroexpand '(cmpr chcm))
(macroexpand '(cmpr chcm item1 item2))
|#
(DEFMACRO BASIS (&rest rest)
(ecase (length rest)
(1 `(basis1 ,@rest))
(2 `(basis2 ,@rest))
(3 `(basis3 ,@rest))))
(DEFUN BASIS2 (object n) ;;;
(declare
(type t object)
(fixnum n))
(the list
(with-slots (basis) object
(declare (type basis basis))
(when (eq :locally-effective basis)
(error "The object ~A is locally-effective." object))
(funcall basis n))))
(DEFMACRO BASIS3 (smst dmns keyword)
(declare (ignore keyword))
`(a-basis2 (basis ,smst) ,dmns))
(DEFMACRO DFFR (&rest rest)
(ecase (length rest)
(1 `(dffr1 ,@rest))
((2 3) `(? (dffr1 ,(first rest)) ,@(rest rest)))))
#|
(macroexpand '(dffr chcm))
(macroexpand '(dffr chcm cmbn))
(macroexpand '(dffr chcm degr gnrt))
|#
;;; Result = (:rslt gnrt value clnm rntm . prpr)
(DEFMACRO MAKE-RSLT (&key gnrt value clnm rntm)
`(list :rslt ,gnrt ,value ,clnm ,rntm))
(DEFMACRO RSLT-GNRT (rslt)
`(second ,rslt))
(DEFMACRO RSLT-VALUE (rslt)
`(third ,rslt))
(DEFMACRO RSLT-CLNM (rslt)
`(fourth ,rslt))
(DEFMACRO RSLT-RNTM (rslt)
`(fifth ,rslt))
(DEFMACRO ? (&rest rest)
(ecase (length rest)
(2 `(?2 ,@rest))
(3 `(?3 ,@rest))))
(DEFMACRO CONTROL (cmpr cmbn)
(if *cmbn-control*
`(do-control ,cmpr ,cmbn)
cmbn))
(DEFMACRO CONTROLN (cmpr cmbn)
(if *cmbn-control*
`(do-control ,cmpr ,cmbn)
nil))
(DEFVAR *WRONG-CMBN*)
;;;
;;; CHCM-ELEMENTARY-OP
;;;
(DEFMACRO I-CMPS (mrph1 &rest rest)
(if rest
`(cmps ,mrph1 (i-cmps ,@rest))
mrph1))
#|
(macroexpand '(i-cmps m1))
(macroexpand '(i-cmps m1 m2))
(macroexpand '(i-cmps m1 m2 m3))
|#
(DEFMACRO I-ADD (mrph1 &rest rest)
(if rest
`(add ,mrph1 (i-add ,@rest))
mrph1))
#|
(macroexpand '(i-add m1))
(macroexpand '(i-add m1 m2))
(macroexpand '(i-add m1 m2 m3))
|#
(DEFMACRO I-SBTR (mrph1 mrph2 &rest rest)
`(sbtr ,mrph1 (i-add ,mrph2 ,@rest)))
#|
(macroexpand '(i-sbtr m1 m2))
(macroexpand '(i-sbtr m1 m2 m3))
|#
;;;
;;; EFFECTIVE HOMOLOGY
;;;
(DEFMACRO BCC (&rest rest)
(case (length rest)
(1 `(bcc1 ,@rest))
(otherwise
`(? (bcc1 ,(first rest)) ,@(rest rest)))))
(DEFMACRO TCC (&rest rest)
(case (length rest)
(1 `(tcc1 ,@rest))
(otherwise
`(? (tcc1 ,(first rest)) ,@(rest rest)))))
(DEFMACRO F (&rest rest)
(case (length rest)
(1 `(f1 ,@rest))
(otherwise
`(? (f1 ,(first rest)) ,@(rest rest)))))
#|
(macroexpand '(f rdct))
(macroexpand '(f rdct cmbn))
(macroexpand '(f rdct degr gnrt))
|#
(DEFMACRO G (&rest rest)
(case (length rest)
(1 `(g1 ,@rest))
(otherwise
`(? (g1 ,(first rest)) ,@(rest rest)))))
(DEFMACRO H (&rest rest)
(case (length rest)
(1 `(h1 ,@rest))
(otherwise
`(? (h1 ,(first rest)) ,@(rest rest)))))
(DEFMACRO LBCC (&rest rest)
(case (length rest)
(1 `(lbcc1 ,@rest))
(otherwise
`(? (lbcc1 ,(first rest)) ,@(rest rest)))))
(DEFMACRO RBCC (&rest rest)
(case (length rest)
(1 `(rbcc1 ,@rest))
(otherwise
`(? (rbcc1 ,(first rest)) ,@(rest rest)))))
(DEFMACRO LF (&rest rest)
(case (length rest)
(1 `(lf1 ,@rest))
(otherwise
`(? (lf1 ,(first rest)) ,@(rest rest)))))
(DEFMACRO LG (&rest rest)
(case (length rest)
(1 `(lg1 ,@rest))
(otherwise
`(? (lg1 ,(first rest)) ,@(rest rest)))))
(DEFMACRO LH (&rest rest)
(case (length rest)
(1 `(lh1 ,@rest))
(otherwise
`(? (lh1 ,(first rest)) ,@(rest rest)))))
(DEFMACRO RF (&rest rest)
(case (length rest)
(1 `(rf1 ,@rest))
(otherwise
`(? (rf1 ,(first rest)) ,@(rest rest)))))
(DEFMACRO RG (&rest rest)
(case (length rest)
(1 `(rg1 ,@rest))
(otherwise
`(? (rg1 ,(first rest)) ,@(rest rest)))))
(DEFMACRO RH (&rest rest)
(case (length rest)
(1 `(rh1 ,@rest))
(otherwise
`(? (rh1 ,(first rest)) ,@(rest rest)))))
;;;
;;; CONES
;;;
(DEFMACRO BCNX (bicn)
`(car ,bicn))
(DEFMACRO IBICN (bicn)
`(cdr ,bicn))
(DEFMACRO BCNB (gnrt)
`(cons :bcnb ,gnrt))
(DEFMACRO BCNC (gnrt)
`(cons :bcnc ,gnrt))
(DEFMACRO BCND (gnrt)
`(cons :bcnd ,gnrt))
(DEFMACRO WITH-BICN ((bcnx ibicn) bicn . body)
`(let ((,bcnx (bcnx ,bicn))
(,ibicn (ibicn ,bicn)))
(declare
(type (member :bcnb :bcnc :bcnd) ,bcnx)
(type gnrt ,ibicn))
,@body))
;;;
;;; TENSOR PRODUCTS
;;;
(DEFMACRO TNPR (degr1 gnrt1 degr2 gnrt2)
`(cons :tnpr (cons (cons ,degr1 ,gnrt1) (cons ,degr2 ,gnrt2))))
(DEFMACRO DEGR1 (tnpr)
`(caadr ,tnpr))
(DEFMACRO GNRT1 (tnpr)
`(cdadr ,tnpr))
(DEFMACRO DEGR2 (tnpr)
`(caddr ,tnpr))
(DEFMACRO GNRT2 (tnpr)
`(cdddr ,tnpr))
(DEFMACRO WITH-TNPR ((degr1 gnrt1 degr2 gnrt2) tnpr . body)
`(let (,@(if degr1 `((,degr1 (degr1 ,tnpr))) nil)
,@(if gnrt1 `((,gnrt1 (gnrt1 ,tnpr))) nil)
,@(if degr2 `((,degr2 (degr2 ,tnpr))) nil)
,@(if gnrt2 `((,gnrt2 (gnrt2 ,tnpr))) nil))
(declare
(fixnum ,@(if degr1 `(,degr1) nil) ,@(if degr2 `(,degr2) nil))
(type gnrt ,@(if gnrt1 `(,gnrt1) nil) ,@(if gnrt2 `(,gnrt2) nil)))
,@body))
#|
(macroexpand '(tnpr 1 a 2 b))
1 (tnpr 2 'a 4 (tnpr 2 'b 2 'c))
(macroexpand-1 '(with-tnpr (degr1 gnrt1 degr2 gnrt2) tnpr
(statement-1)
(statement-2)))
(macroexpand-1 '(with-tnpr (nil gnrt1 degr2 gnrt2) tnpr
(statement-1)
(statement-2)))
|#
;;;
;;; COALGEBRAS
;;;
(DEFMACRO CPRD (&rest rest)
(case (length rest)
(1 `(cprd1 ,@rest))
((2 3) `(? (cprd1 ,(first rest)) ,@(rest rest)))))
;;;
;;; COBAR
;;;
(DEFMACRO CBGN (degr gnrt)
`(cons ,degr ,gnrt))
(DEFMACRO CDEGR (cbgn)
`(car ,cbgn))
(DEFMACRO CGNRT (cbgn)
`(cdr ,cbgn))
(DEFMACRO -CDEGR (cbgn)
`(caar ,cbgn))
(DEFMACRO -CGNRT (cbgn)
`(cdar ,cbgn))
(DEFMACRO WITH-CBGN ((cdegr cgnrt) cbgn . body)
`(let ((,cdegr (cdegr ,cbgn))
(,cgnrt (cgnrt ,cbgn)))
(declare
(fixnum ,cdegr)
(type gnrt ,cgnrt))
,@body))
(DEFMACRO WITH--CBGN ((cdegr cgnrt) cbgn . body)
`(let ((,cdegr (-cdegr ,cbgn))
(,cgnrt (-cgnrt ,cbgn)))
(declare
(fixnum ,cdegr)
(type gnrt ,cgnrt))
,@body))
(DEFMACRO MAKE-ALLP (&key list)
`(cons :allp ,list))
(DEFMACRO ALLP-LIST (allp)
`(cdr ,allp))
(DEFMACRO WITH-ALLP ((list) allp . body)
`(let ((,list (allp-list ,allp)))
(declare (list ,list))
,@body))
(DEFMACRO GNRT-ALLP-TNPR (degr gnrt allp)
`(make-allp :list (cons (cbgn (1- ,degr) ,gnrt) ,allp)))
;;;
;;; ALGEBRAS
;;;
(DEFMACRO APRD (&rest rest)
(case (length rest)
(1 `(aprd1 ,@rest))
((2 3) `(? (aprd1 ,(first rest)) ,@(rest rest)))))
;;;
;;; BAR
;;;
(DEFMACRO BRGN (degr gnrt)
`(cons ,degr ,gnrt))
(DEFMACRO BDEGR (brgn)
`(car ,brgn))
(DEFMACRO BGNRT (brgn)
`(cdr ,brgn))
(DEFMACRO -BDEGR (brgn)
`(caar ,brgn))
(DEFMACRO -BGNRT (brgn)
`(cdar ,brgn))
(DEFMACRO WITH-BRGN ((bdegr bgnrt) brgn . body)
`(let ((,bdegr (bdegr ,brgn))
(,bgnrt (bgnrt ,brgn)))
(declare
(fixnum ,bdegr)
(type gnrt ,bgnrt))
,@body))
(DEFMACRO WITH--BRGN ((bdegr bgnrt) brgn . body)
`(let ((,bdegr (-bdegr ,brgn))
(,bgnrt (-bgnrt ,brgn)))
(declare
(fixnum ,bdegr)
(type gnrt ,bgnrt))
,@body))
(DEFMACRO MAKE-ABAR (&key list)
`(cons :abar ,list))
(DEFMACRO ABAR-LIST (abar)
`(cdr ,abar))
(DEFMACRO WITH-ABAR ((list) abar . body)
`(let ((,list (abar-list ,abar)))
(declare (list ,list))
,@body))
(DEFMACRO MAKE-GBAR (&key dmns list)
`(cons :gbar (cons ,dmns ,list)))
(DEFMACRO GBAR-DMNS (gbar)
`(cadr ,gbar))
(DEFMACRO GBAR-LIST (gbar)
`(cddr ,gbar))
(DEFMACRO WITH-GBAR ((dmns list) gbar . body)
`(let ((,dmns (gbar-dmns ,gbar))
(,list (gbar-list ,gbar)))
(declare
(fixnum ,dmns)
(list ,list))
,@body))
(DEFMACRO GNRT-GBAR-TNPR (degr gnrt gbar)
`(make-gbar :list (cons (brgn (1- ,degr) ,gnrt) ,gbar)))
;;;
;;; SIMPLICIAL SETS
;;;
(DEFMACRO ABSM (dgop gmsm)
`(cons :absm (cons ,dgop ,gmsm)))
(DEFMACRO DGOP (absm)
`(cadr ,absm))
(DEFMACRO GMSM (absm)
`(cddr ,absm))
(DEFMACRO WITH-ABSM ((dgop-var gmsm-var) absm . body)
`(let ((,dgop-var (dgop ,absm))
(,gmsm-var (gmsm ,absm)))
(declare
(fixnum ,dgop-var)
(type gmsm ,gmsm-var))
,@body))
(DEFMACRO DEGENERATE-P (absm)
`(plusp (dgop ,absm)))
(DEFMACRO NON-DEGENERATE-P (absm)
`(zerop (dgop ,absm)))
(DEFMACRO FACE (&rest rest)
(ecase (length rest)
(1 `(face1 ,@rest))
(4 `(face4 ,@rest))))
(DEFMACRO A-FACE4 (face indx dmns absm)
`(ia-face4 ,face ,indx ,dmns (cdr ,absm)))
;;;
;;; DELTA
;;;
(DEFMACRO D (igmsm)
`(cons :delt ,igmsm))
;;;
;;; SPECIAL-SMSTS
;;;
;;; GMSM-FACES-INFO = (gmsm (simple-vector absm) . dffr)
;;; faces
(DEFMACRO MAKE-GMSM-FACES-INFO (&key gmsm faces dffr)
`(cons ,gmsm (cons ,faces ,dffr)))
(DEFMACRO INFO-GMSM (gmsm-faces-info)
`(car ,gmsm-faces-info))
(DEFMACRO INFO-FACES (gmsm-faces-info)
`(cadr ,gmsm-faces-info))
(DEFMACRO INFO-FACE-I (gmsm-faces-info i)
`(svref (cadr ,gmsm-faces-info) ,i))
(DEFMACRO INFO-DFFR (gmsm-faces-info)
`(cddr ,gmsm-faces-info))
;;;
;;; CARTESIAN PRODUCTS
;;;
(DEFMACRO CRPR (&rest rest)
(ecase (length rest)
(2 `(cons :crpr (cons (cdr ,(first rest)) (cdr ,(second rest)))))
(4 `(cons :crpr (cons
(cons ,(first rest) ,(second rest))
(cons ,(third rest) ,(fourth rest)))))))
#|
(macroexpand '(crpr absm1 absm2))
(macroexpand '(crpr dgop1 gmsm1 dgop2 gmsm2))
|#
(DEFMACRO DGOP1 (crpr)
`(caadr ,crpr))
(DEFMACRO GMSM1 (crpr)
`(cdadr ,crpr))
(DEFMACRO DGOP2 (crpr)
`(caddr ,crpr))
(DEFMACRO GMSM2 (crpr)
`(cdddr ,crpr))
(DEFMACRO ABSM1 (crpr)
`(cons :absm (cadr ,crpr)))
(DEFMACRO ABSM2 (crpr)
`(cons :absm (cddr ,crpr)))
#|
(setf c (crpr 1 'a 2 'b))
(dgop1 c)
(gmsm1 c)
(dgop2 c)
(gmsm2 c)
(absm1 c)
(absm2 c)
|#
(DEFMACRO WITH-CRPR (&rest rest)
(ecase (length (first rest))
(2 `(with-crpr-2 ,@rest))
(4 `(with-crpr-4 ,@rest))))
(DEFMACRO WITH-CRPR-2 ((absm1 absm2) crpr . body)
`(let ((,absm1 (cons :absm (cadr ,crpr)))
(,absm2 (cons :absm (cddr ,crpr))))
(declare (type absm ,absm1 ,absm2))
,@body))
(DEFMACRO WITH-CRPR-4 ((dgop1 gmsm1 dgop2 gmsm2) crpr . body)
`(let ((,dgop1 (dgop1 ,crpr))
(,gmsm1 (gmsm1 ,crpr))
(,dgop2 (dgop2 ,crpr))
(,gmsm2 (gmsm2 ,crpr)))
(declare
(fixnum ,dgop1 ,dgop2)
(type gmsm ,gmsm1 ,gmsm2))
,@body))
#|
(macroexpand-1
(macroexpand-1 '(with-crpr (dgop1 gmsm1 dgop2 gmsm2) crpr
(statement-1)
(statement-2))))
(macroexpand-1
(macroexpand-1 '(with-crpr (absm1 absm2) crpr
(statement-1)
(statement-2))))
|#
;;;
;;; EILENBERG-ZILBER
;;;
(DEFMACRO EILENBERG-ZILBER (&rest rest)
`(ez ,@rest))
;;;
;;; LOOP SPACES
;;;
(DEFMACRO POWR (gmsm expn)
`(cons ,gmsm ,expn))
(DEFMACRO PGMSM (powr)
`(car ,powr))
(DEFMACRO EXPN (powr)
`(cdr ,powr))
(DEFMACRO WITH-POWR ((gmsm expn) powr . body)
`(let ((,gmsm (car ,powr))
(,expn (cdr ,powr)))
(declare
(type gmsm ,gmsm)
(fixnum expn))
,@body))
(DEFMACRO WITH-APOWR ((dgop gmsm expn) apowr . body)
`(let ((,dgop (apdgop ,apowr))
(,gmsm (cadr ,apowr))
(,expn (cddr ,apowr)))
(declare
(fixnum ,dgop ,expn)
(type gmsm ,gmsm))
,@body))
(DEFMACRO APOWR (dgop gmsm expn)
`(cons ,dgop (cons ,gmsm ,expn)))
(DEFMACRO APDGOP (apowr)
`(car ,apowr))
(DEFMACRO APGMSM (apowr)
`(cadr ,apowr))
(DEFMACRO APEXPN (apowr)
`(cddr ,apowr))
(DEFMACRO MAKE-LOOP (&key list)
`(cons :loop ,list))
(DEFMACRO LOOP-LIST (loop)
`(cdr ,loop))
;; CONSTRUCTOR
(DEFMACRO WHEN-SLOT (slot-name . body)
`(when (or (eq slot-names t)
(member ',slot-name slot-names))
,@body))
#|
(pprint
(macroexpand-1
'(when-slot dfnt (statement-1) (statement-2))))
|#
(DEFMACRO ALREADY (object dfnt)
(let ((sfound (gensym)))
`(let ((,sfound (find ,dfnt *k-list* :key #'dfnt :test #'equal)))
(declare (type (or kenzo-object null) ,sfound))
(when ,sfound
(return-from ,object ,sfound)))))
#|
(pprint
(macroexpand-1
'(already chain-complex '(z-chcm))))
|#