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Type | Label | Description |
---|---|---|
Statement | ||
Theorem | opelcn 7301 | Ordered pair membership in the class of complex numbers. (Contributed by NM, 14-May-1996.) |
Theorem | opelreal 7302 | Ordered pair membership in class of real subset of complex numbers. (Contributed by NM, 22-Feb-1996.) |
Theorem | elreal 7303* | Membership in class of real numbers. (Contributed by NM, 31-Mar-1996.) |
Theorem | elrealeu 7304* | The real number mapping in elreal 7303 is unique. (Contributed by Jim Kingdon, 11-Jul-2021.) |
Theorem | elreal2 7305 | Ordered pair membership in the class of complex numbers. (Contributed by Mario Carneiro, 15-Jun-2013.) |
Theorem | 0ncn 7306 | The empty set is not a complex number. Note: do not use this after the real number axioms are developed, since it is a construction-dependent property. (Contributed by NM, 2-May-1996.) |
Theorem | ltrelre 7307 | 'Less than' is a relation on real numbers. (Contributed by NM, 22-Feb-1996.) |
Theorem | addcnsr 7308 | Addition of complex numbers in terms of signed reals. (Contributed by NM, 28-May-1995.) |
Theorem | mulcnsr 7309 | Multiplication of complex numbers in terms of signed reals. (Contributed by NM, 9-Aug-1995.) |
Theorem | eqresr 7310 | Equality of real numbers in terms of intermediate signed reals. (Contributed by NM, 10-May-1996.) |
Theorem | addresr 7311 | Addition of real numbers in terms of intermediate signed reals. (Contributed by NM, 10-May-1996.) |
Theorem | mulresr 7312 | Multiplication of real numbers in terms of intermediate signed reals. (Contributed by NM, 10-May-1996.) |
Theorem | ltresr 7313 | Ordering of real subset of complex numbers in terms of signed reals. (Contributed by NM, 22-Feb-1996.) |
Theorem | ltresr2 7314 | Ordering of real subset of complex numbers in terms of signed reals. (Contributed by NM, 22-Feb-1996.) |
Theorem | dfcnqs 7315 | Technical trick to permit reuse of previous lemmas to prove arithmetic operation laws in from those in . The trick involves qsid 6303, which shows that the coset of the converse epsilon relation (which is not an equivalence relation) acts as an identity divisor for the quotient set operation. This lets us "pretend" that is a quotient set, even though it is not (compare df-c 7293), and allows us to reuse some of the equivalence class lemmas we developed for the transition from positive reals to signed reals, etc. (Contributed by NM, 13-Aug-1995.) |
Theorem | addcnsrec 7316 | Technical trick to permit re-use of some equivalence class lemmas for operation laws. See dfcnqs 7315 and mulcnsrec 7317. (Contributed by NM, 13-Aug-1995.) |
Theorem | mulcnsrec 7317 | Technical trick to permit re-use of some equivalence class lemmas for operation laws. The trick involves ecidg 6302, which shows that the coset of the converse epsilon relation (which is not an equivalence relation) leaves a set unchanged. See also dfcnqs 7315. (Contributed by NM, 13-Aug-1995.) |
Theorem | addvalex 7318 | Existence of a sum. This is dependent on how we define so once we proceed to real number axioms we will replace it with theorems such as addcl 7404. (Contributed by Jim Kingdon, 14-Jul-2021.) |
Theorem | pitonnlem1 7319* | Lemma for pitonn 7322. Two ways to write the number one. (Contributed by Jim Kingdon, 24-Apr-2020.) |
Theorem | pitonnlem1p1 7320 | Lemma for pitonn 7322. Simplifying an expression involving signed reals. (Contributed by Jim Kingdon, 26-Apr-2020.) |
Theorem | pitonnlem2 7321* | Lemma for pitonn 7322. Two ways to add one to a number. (Contributed by Jim Kingdon, 24-Apr-2020.) |
Theorem | pitonn 7322* | Mapping from to . (Contributed by Jim Kingdon, 22-Apr-2020.) |
Theorem | pitoregt0 7323* | Embedding from to yields a number greater than zero. (Contributed by Jim Kingdon, 15-Jul-2021.) |
Theorem | pitore 7324* | Embedding from to . Similar to pitonn 7322 but separate in the sense that we have not proved nnssre 8354 yet. (Contributed by Jim Kingdon, 15-Jul-2021.) |
Theorem | recnnre 7325* | Embedding the reciprocal of a natural number into . (Contributed by Jim Kingdon, 15-Jul-2021.) |
Theorem | peano1nnnn 7326* | One is an element of . This is a counterpart to 1nn 8361 designed for real number axioms which involve natural numbers (notably, axcaucvg 7372). (Contributed by Jim Kingdon, 14-Jul-2021.) (New usage is discouraged.) |
Theorem | peano2nnnn 7327* | A successor of a positive integer is a positive integer. This is a counterpart to peano2nn 8362 designed for real number axioms which involve to natural numbers (notably, axcaucvg 7372). (Contributed by Jim Kingdon, 14-Jul-2021.) (New usage is discouraged.) |
Theorem | ltrennb 7328* | Ordering of natural numbers with or . (Contributed by Jim Kingdon, 13-Jul-2021.) |
Theorem | ltrenn 7329* | Ordering of natural numbers with or . (Contributed by Jim Kingdon, 12-Jul-2021.) |
Theorem | recidpipr 7330* | Another way of saying that a number times its reciprocal is one. (Contributed by Jim Kingdon, 17-Jul-2021.) |
Theorem | recidpirqlemcalc 7331 | Lemma for recidpirq 7332. Rearranging some of the expressions. (Contributed by Jim Kingdon, 17-Jul-2021.) |
Theorem | recidpirq 7332* | A real number times its reciprocal is one, where reciprocal is expressed with . (Contributed by Jim Kingdon, 15-Jul-2021.) |
Theorem | axcnex 7333 | The complex numbers form a set. Use cnex 7403 instead. (Contributed by Mario Carneiro, 17-Nov-2014.) (New usage is discouraged.) |
Theorem | axresscn 7334 | The real numbers are a subset of the complex numbers. Axiom for real and complex numbers, derived from set theory. This construction-dependent theorem should not be referenced directly; instead, use ax-resscn 7374. (Contributed by NM, 1-Mar-1995.) (Proof shortened by Andrew Salmon, 12-Aug-2011.) (New usage is discouraged.) |
Theorem | ax1cn 7335 | 1 is a complex number. Axiom for real and complex numbers, derived from set theory. This construction-dependent theorem should not be referenced directly; instead, use ax-1cn 7375. (Contributed by NM, 12-Apr-2007.) (New usage is discouraged.) |
Theorem | ax1re 7336 |
1 is a real number. Axiom for real and complex numbers, derived from set
theory. This construction-dependent theorem should not be referenced
directly; instead, use ax-1re 7376.
In the Metamath Proof Explorer, this is not a complex number axiom but is proved from ax-1cn 7375 and the other axioms. It is not known whether we can do so here, but the Metamath Proof Explorer proof (accessed 13-Jan-2020) uses excluded middle. (Contributed by Jim Kingdon, 13-Jan-2020.) (New usage is discouraged.) |
Theorem | axicn 7337 | is a complex number. Axiom for real and complex numbers, derived from set theory. This construction-dependent theorem should not be referenced directly; instead, use ax-icn 7377. (Contributed by NM, 23-Feb-1996.) (New usage is discouraged.) |
Theorem | axaddcl 7338 | Closure law for addition of complex numbers. Axiom for real and complex numbers, derived from set theory. This construction-dependent theorem should not be referenced directly, nor should the proven axiom ax-addcl 7378 be used later. Instead, in most cases use addcl 7404. (Contributed by NM, 14-Jun-1995.) (New usage is discouraged.) |
Theorem | axaddrcl 7339 | Closure law for addition in the real subfield of complex numbers. Axiom for real and complex numbers, derived from set theory. This construction-dependent theorem should not be referenced directly, nor should the proven axiom ax-addrcl 7379 be used later. Instead, in most cases use readdcl 7405. (Contributed by NM, 31-Mar-1996.) (New usage is discouraged.) |
Theorem | axmulcl 7340 | Closure law for multiplication of complex numbers. Axiom for real and complex numbers, derived from set theory. This construction-dependent theorem should not be referenced directly, nor should the proven axiom ax-mulcl 7380 be used later. Instead, in most cases use mulcl 7406. (Contributed by NM, 10-Aug-1995.) (New usage is discouraged.) |
Theorem | axmulrcl 7341 | Closure law for multiplication in the real subfield of complex numbers. Axiom for real and complex numbers, derived from set theory. This construction-dependent theorem should not be referenced directly, nor should the proven axiom ax-mulrcl 7381 be used later. Instead, in most cases use remulcl 7407. (New usage is discouraged.) (Contributed by NM, 31-Mar-1996.) |
Theorem | axaddcom 7342 |
Addition commutes. Axiom for real and complex numbers, derived from set
theory. This construction-dependent theorem should not be referenced
directly, nor should the proven axiom ax-addcom 7382 be used later.
Instead, use addcom 7556.
In the Metamath Proof Explorer this is not a complex number axiom but is instead proved from other axioms. That proof relies on real number trichotomy and it is not known whether it is possible to prove this from the other axioms without it. (Contributed by Jim Kingdon, 17-Jan-2020.) (New usage is discouraged.) |
Theorem | axmulcom 7343 | Multiplication of complex numbers is commutative. Axiom for real and complex numbers, derived from set theory. This construction-dependent theorem should not be referenced directly, nor should the proven axiom ax-mulcom 7383 be used later. Instead, use mulcom 7408. (Contributed by NM, 31-Aug-1995.) (New usage is discouraged.) |
Theorem | axaddass 7344 | Addition of complex numbers is associative. This theorem transfers the associative laws for the real and imaginary signed real components of complex number pairs, to complex number addition itself. Axiom for real and complex numbers, derived from set theory. This construction-dependent theorem should not be referenced directly, nor should the proven axiom ax-addass 7384 be used later. Instead, use addass 7409. (Contributed by NM, 2-Sep-1995.) (New usage is discouraged.) |
Theorem | axmulass 7345 | Multiplication of complex numbers is associative. Axiom for real and complex numbers, derived from set theory. This construction-dependent theorem should not be referenced directly; instead, use ax-mulass 7385. (Contributed by NM, 3-Sep-1995.) (New usage is discouraged.) |
Theorem | axdistr 7346 | Distributive law for complex numbers (left-distributivity). Axiom for real and complex numbers, derived from set theory. This construction-dependent theorem should not be referenced directly, nor should the proven axiom ax-distr 7386 be used later. Instead, use adddi 7411. (Contributed by NM, 2-Sep-1995.) (New usage is discouraged.) |
Theorem | axi2m1 7347 | i-squared equals -1 (expressed as i-squared plus 1 is 0). Axiom for real and complex numbers, derived from set theory. This construction-dependent theorem should not be referenced directly; instead, use ax-i2m1 7387. (Contributed by NM, 5-May-1996.) (New usage is discouraged.) |
Theorem | ax0lt1 7348 |
0 is less than 1. Axiom for real and complex numbers, derived from set
theory. This construction-dependent theorem should not be referenced
directly; instead, use ax-0lt1 7388.
The version of this axiom in the Metamath Proof Explorer reads ; here we change it to . The proof of from in the Metamath Proof Explorer (accessed 12-Jan-2020) relies on real number trichotomy. (Contributed by Jim Kingdon, 12-Jan-2020.) (New usage is discouraged.) |
Theorem | ax1rid 7349 | is an identity element for real multiplication. Axiom for real and complex numbers, derived from set theory. This construction-dependent theorem should not be referenced directly; instead, use ax-1rid 7389. (Contributed by Scott Fenton, 3-Jan-2013.) (New usage is discouraged.) |
Theorem | ax0id 7350 |
is an identity element
for real addition. Axiom for real and
complex numbers, derived from set theory. This construction-dependent
theorem should not be referenced directly; instead, use ax-0id 7390.
In the Metamath Proof Explorer this is not a complex number axiom but is instead proved from other axioms. That proof relies on excluded middle and it is not known whether it is possible to prove this from the other axioms without excluded middle. (Contributed by Jim Kingdon, 16-Jan-2020.) (New usage is discouraged.) |
Theorem | axrnegex 7351* | Existence of negative of real number. Axiom for real and complex numbers, derived from set theory. This construction-dependent theorem should not be referenced directly; instead, use ax-rnegex 7391. (Contributed by NM, 15-May-1996.) (New usage is discouraged.) |
Theorem | axprecex 7352* |
Existence of positive reciprocal of positive real number. Axiom for
real and complex numbers, derived from set theory. This
construction-dependent theorem should not be referenced directly;
instead, use ax-precex 7392.
In treatments which assume excluded middle, the condition is generally replaced by , and it may not be necessary to state that the reciproacal is positive. (Contributed by Jim Kingdon, 6-Feb-2020.) (New usage is discouraged.) |
Theorem | axcnre 7353* | A complex number can be expressed in terms of two reals. Definition 10-1.1(v) of [Gleason] p. 130. Axiom for real and complex numbers, derived from set theory. This construction-dependent theorem should not be referenced directly; instead, use ax-cnre 7393. (Contributed by NM, 13-May-1996.) (New usage is discouraged.) |
Theorem | axpre-ltirr 7354 | Real number less-than is irreflexive. Axiom for real and complex numbers, derived from set theory. This construction-dependent theorem should not be referenced directly; instead, use ax-pre-ltirr 7394. (Contributed by Jim Kingdon, 12-Jan-2020.) (New usage is discouraged.) |
Theorem | axpre-ltwlin 7355 | Real number less-than is weakly linear. Axiom for real and complex numbers, derived from set theory. This construction-dependent theorem should not be referenced directly; instead, use ax-pre-ltwlin 7395. (Contributed by Jim Kingdon, 12-Jan-2020.) (New usage is discouraged.) |
Theorem | axpre-lttrn 7356 | Ordering on reals is transitive. Axiom for real and complex numbers, derived from set theory. This construction-dependent theorem should not be referenced directly; instead, use ax-pre-lttrn 7396. (Contributed by NM, 19-May-1996.) (Revised by Mario Carneiro, 16-Jun-2013.) (New usage is discouraged.) |
Theorem | axpre-apti 7357 |
Apartness of reals is tight. Axiom for real and complex numbers,
derived from set theory. This construction-dependent theorem should not
be referenced directly; instead, use ax-pre-apti 7397.
(Contributed by Jim Kingdon, 29-Jan-2020.) (New usage is discouraged.) |
Theorem | axpre-ltadd 7358 | Ordering property of addition on reals. Axiom for real and complex numbers, derived from set theory. This construction-dependent theorem should not be referenced directly; instead, use ax-pre-ltadd 7398. (Contributed by NM, 11-May-1996.) (New usage is discouraged.) |
Theorem | axpre-mulgt0 7359 | The product of two positive reals is positive. Axiom for real and complex numbers, derived from set theory. This construction-dependent theorem should not be referenced directly; instead, use ax-pre-mulgt0 7399. (Contributed by NM, 13-May-1996.) (New usage is discouraged.) |
Theorem | axpre-mulext 7360 |
Strong extensionality of multiplication (expressed in terms of
).
Axiom for real and complex numbers, derived from set theory.
This construction-dependent theorem should not be referenced directly;
instead, use ax-pre-mulext 7400.
(Contributed by Jim Kingdon, 18-Feb-2020.) (New usage is discouraged.) |
Theorem | rereceu 7361* | The reciprocal from axprecex 7352 is unique. (Contributed by Jim Kingdon, 15-Jul-2021.) |
Theorem | recriota 7362* | Two ways to express the reciprocal of a natural number. (Contributed by Jim Kingdon, 11-Jul-2021.) |
Theorem | axarch 7363* |
Archimedean axiom. The Archimedean property is more naturally stated
once we have defined . Unless we find another way to state it,
we'll just use the right hand side of dfnn2 8352 in stating what we mean by
"natural number" in the context of this axiom.
This construction-dependent theorem should not be referenced directly; instead, use ax-arch 7401. (Contributed by Jim Kingdon, 22-Apr-2020.) (New usage is discouraged.) |
Theorem | peano5nnnn 7364* | Peano's inductive postulate. This is a counterpart to peano5nni 8353 designed for real number axioms which involve natural numbers (notably, axcaucvg 7372). (Contributed by Jim Kingdon, 14-Jul-2021.) (New usage is discouraged.) |
Theorem | nnindnn 7365* | Principle of Mathematical Induction (inference schema). This is a counterpart to nnind 8366 designed for real number axioms which involve natural numbers (notably, axcaucvg 7372). (Contributed by Jim Kingdon, 14-Jul-2021.) (New usage is discouraged.) |
Theorem | nntopi 7366* | Mapping from to . (Contributed by Jim Kingdon, 13-Jul-2021.) |
Theorem | axcaucvglemcl 7367* | Lemma for axcaucvg 7372. Mapping to and . (Contributed by Jim Kingdon, 10-Jul-2021.) |
Theorem | axcaucvglemf 7368* | Lemma for axcaucvg 7372. Mapping to and yields a sequence. (Contributed by Jim Kingdon, 9-Jul-2021.) |
Theorem | axcaucvglemval 7369* | Lemma for axcaucvg 7372. Value of sequence when mapping to and . (Contributed by Jim Kingdon, 10-Jul-2021.) |
Theorem | axcaucvglemcau 7370* | Lemma for axcaucvg 7372. The result of mapping to and satisfies the Cauchy condition. (Contributed by Jim Kingdon, 9-Jul-2021.) |
Theorem | axcaucvglemres 7371* | Lemma for axcaucvg 7372. Mapping the limit from and . (Contributed by Jim Kingdon, 10-Jul-2021.) |
Theorem | axcaucvg 7372* |
Real number completeness axiom. A Cauchy sequence with a modulus of
convergence converges. This is basically Corollary 11.2.13 of [HoTT],
p. (varies). The HoTT book theorem has a modulus of convergence
(that is, a rate of convergence) specified by (11.2.9) in HoTT whereas
this theorem fixes the rate of convergence to say that all terms after
the nth term must be within of the nth term (it should
later
be able to prove versions of this theorem with a different fixed rate
or a modulus of convergence supplied as a hypothesis).
Because we are stating this axiom before we have introduced notations for or division, we use for the natural numbers and express a reciprocal in terms of . This construction-dependent theorem should not be referenced directly; instead, use ax-caucvg 7402. (Contributed by Jim Kingdon, 8-Jul-2021.) (New usage is discouraged.) |
Axiom | ax-cnex 7373 | The complex numbers form a set. Proofs should normally use cnex 7403 instead. (New usage is discouraged.) (Contributed by NM, 1-Mar-1995.) |
Axiom | ax-resscn 7374 | The real numbers are a subset of the complex numbers. Axiom for real and complex numbers, justified by theorem axresscn 7334. (Contributed by NM, 1-Mar-1995.) |
Axiom | ax-1cn 7375 | 1 is a complex number. Axiom for real and complex numbers, justified by theorem ax1cn 7335. (Contributed by NM, 1-Mar-1995.) |
Axiom | ax-1re 7376 | 1 is a real number. Axiom for real and complex numbers, justified by theorem ax1re 7336. Proofs should use 1re 7424 instead. (Contributed by Jim Kingdon, 13-Jan-2020.) (New usage is discouraged.) |
Axiom | ax-icn 7377 | is a complex number. Axiom for real and complex numbers, justified by theorem axicn 7337. (Contributed by NM, 1-Mar-1995.) |
Axiom | ax-addcl 7378 | Closure law for addition of complex numbers. Axiom for real and complex numbers, justified by theorem axaddcl 7338. Proofs should normally use addcl 7404 instead, which asserts the same thing but follows our naming conventions for closures. (New usage is discouraged.) (Contributed by NM, 22-Nov-1994.) |
Axiom | ax-addrcl 7379 | Closure law for addition in the real subfield of complex numbers. Axiom for real and complex numbers, justified by theorem axaddrcl 7339. Proofs should normally use readdcl 7405 instead. (New usage is discouraged.) (Contributed by NM, 22-Nov-1994.) |
Axiom | ax-mulcl 7380 | Closure law for multiplication of complex numbers. Axiom for real and complex numbers, justified by theorem axmulcl 7340. Proofs should normally use mulcl 7406 instead. (New usage is discouraged.) (Contributed by NM, 22-Nov-1994.) |
Axiom | ax-mulrcl 7381 | Closure law for multiplication in the real subfield of complex numbers. Axiom for real and complex numbers, justified by theorem axmulrcl 7341. Proofs should normally use remulcl 7407 instead. (New usage is discouraged.) (Contributed by NM, 22-Nov-1994.) |
Axiom | ax-addcom 7382 | Addition commutes. Axiom for real and complex numbers, justified by theorem axaddcom 7342. Proofs should normally use addcom 7556 instead. (New usage is discouraged.) (Contributed by Jim Kingdon, 17-Jan-2020.) |
Axiom | ax-mulcom 7383 | Multiplication of complex numbers is commutative. Axiom for real and complex numbers, justified by theorem axmulcom 7343. Proofs should normally use mulcom 7408 instead. (New usage is discouraged.) (Contributed by NM, 22-Nov-1994.) |
Axiom | ax-addass 7384 | Addition of complex numbers is associative. Axiom for real and complex numbers, justified by theorem axaddass 7344. Proofs should normally use addass 7409 instead. (New usage is discouraged.) (Contributed by NM, 22-Nov-1994.) |
Axiom | ax-mulass 7385 | Multiplication of complex numbers is associative. Axiom for real and complex numbers, justified by theorem axmulass 7345. Proofs should normally use mulass 7410 instead. (New usage is discouraged.) (Contributed by NM, 22-Nov-1994.) |
Axiom | ax-distr 7386 | Distributive law for complex numbers (left-distributivity). Axiom for real and complex numbers, justified by theorem axdistr 7346. Proofs should normally use adddi 7411 instead. (New usage is discouraged.) (Contributed by NM, 22-Nov-1994.) |
Axiom | ax-i2m1 7387 | i-squared equals -1 (expressed as i-squared plus 1 is 0). Axiom for real and complex numbers, justified by theorem axi2m1 7347. (Contributed by NM, 29-Jan-1995.) |
Axiom | ax-0lt1 7388 | 0 is less than 1. Axiom for real and complex numbers, justified by theorem ax0lt1 7348. Proofs should normally use 0lt1 7547 instead. (New usage is discouraged.) (Contributed by Jim Kingdon, 12-Jan-2020.) |
Axiom | ax-1rid 7389 | is an identity element for real multiplication. Axiom for real and complex numbers, justified by theorem ax1rid 7349. (Contributed by NM, 29-Jan-1995.) |
Axiom | ax-0id 7390 |
is an identity element
for real addition. Axiom for real and
complex numbers, justified by theorem ax0id 7350.
Proofs should normally use addid1 7557 instead. (New usage is discouraged.) (Contributed by Jim Kingdon, 16-Jan-2020.) |
Axiom | ax-rnegex 7391* | Existence of negative of real number. Axiom for real and complex numbers, justified by theorem axrnegex 7351. (Contributed by Eric Schmidt, 21-May-2007.) |
Axiom | ax-precex 7392* | Existence of reciprocal of positive real number. Axiom for real and complex numbers, justified by theorem axprecex 7352. (Contributed by Jim Kingdon, 6-Feb-2020.) |
Axiom | ax-cnre 7393* | A complex number can be expressed in terms of two reals. Definition 10-1.1(v) of [Gleason] p. 130. Axiom for real and complex numbers, justified by theorem axcnre 7353. For naming consistency, use cnre 7421 for new proofs. (New usage is discouraged.) (Contributed by NM, 9-May-1999.) |
Axiom | ax-pre-ltirr 7394 | Real number less-than is irreflexive. Axiom for real and complex numbers, justified by theorem ax-pre-ltirr 7394. (Contributed by Jim Kingdon, 12-Jan-2020.) |
Axiom | ax-pre-ltwlin 7395 | Real number less-than is weakly linear. Axiom for real and complex numbers, justified by theorem axpre-ltwlin 7355. (Contributed by Jim Kingdon, 12-Jan-2020.) |
Axiom | ax-pre-lttrn 7396 | Ordering on reals is transitive. Axiom for real and complex numbers, justified by theorem axpre-lttrn 7356. (Contributed by NM, 13-Oct-2005.) |
Axiom | ax-pre-apti 7397 | Apartness of reals is tight. Axiom for real and complex numbers, justified by theorem axpre-apti 7357. (Contributed by Jim Kingdon, 29-Jan-2020.) |
Axiom | ax-pre-ltadd 7398 | Ordering property of addition on reals. Axiom for real and complex numbers, justified by theorem axpre-ltadd 7358. (Contributed by NM, 13-Oct-2005.) |
Axiom | ax-pre-mulgt0 7399 | The product of two positive reals is positive. Axiom for real and complex numbers, justified by theorem axpre-mulgt0 7359. (Contributed by NM, 13-Oct-2005.) |
Axiom | ax-pre-mulext 7400 |
Strong extensionality of multiplication (expressed in terms of ).
Axiom for real and complex numbers, justified by theorem axpre-mulext 7360
(Contributed by Jim Kingdon, 18-Feb-2020.) |
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