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Type | Label | Description |
---|---|---|
Statement | ||
Theorem | ltanqg 7201 | Ordering property of addition for positive fractions. Proposition 9-2.6(ii) of [Gleason] p. 120. (Contributed by Jim Kingdon, 22-Sep-2019.) |
Theorem | ltmnqg 7202 | Ordering property of multiplication for positive fractions. Proposition 9-2.6(iii) of [Gleason] p. 120. (Contributed by Jim Kingdon, 22-Sep-2019.) |
Theorem | ltanqi 7203 | Ordering property of addition for positive fractions. One direction of ltanqg 7201. (Contributed by Jim Kingdon, 9-Dec-2019.) |
Theorem | ltmnqi 7204 | Ordering property of multiplication for positive fractions. One direction of ltmnqg 7202. (Contributed by Jim Kingdon, 9-Dec-2019.) |
Theorem | lt2addnq 7205 | Ordering property of addition for positive fractions. (Contributed by Jim Kingdon, 7-Dec-2019.) |
Theorem | lt2mulnq 7206 | Ordering property of multiplication for positive fractions. (Contributed by Jim Kingdon, 18-Jul-2021.) |
Theorem | 1lt2nq 7207 | One is less than two (one plus one). (Contributed by NM, 13-Mar-1996.) (Revised by Mario Carneiro, 10-May-2013.) |
Theorem | ltaddnq 7208 | The sum of two fractions is greater than one of them. (Contributed by NM, 14-Mar-1996.) (Revised by Mario Carneiro, 10-May-2013.) |
Theorem | ltexnqq 7209* | Ordering on positive fractions in terms of existence of sum. Definition in Proposition 9-2.6 of [Gleason] p. 119. (Contributed by Jim Kingdon, 23-Sep-2019.) |
Theorem | ltexnqi 7210* | Ordering on positive fractions in terms of existence of sum. (Contributed by Jim Kingdon, 30-Apr-2020.) |
Theorem | halfnqq 7211* | One-half of any positive fraction is a fraction. (Contributed by Jim Kingdon, 23-Sep-2019.) |
Theorem | halfnq 7212* | One-half of any positive fraction exists. Lemma for Proposition 9-2.6(i) of [Gleason] p. 120. (Contributed by NM, 16-Mar-1996.) (Revised by Mario Carneiro, 10-May-2013.) |
Theorem | nsmallnqq 7213* | There is no smallest positive fraction. (Contributed by Jim Kingdon, 24-Sep-2019.) |
Theorem | nsmallnq 7214* | There is no smallest positive fraction. (Contributed by NM, 26-Apr-1996.) (Revised by Mario Carneiro, 10-May-2013.) |
Theorem | subhalfnqq 7215* | There is a number which is less than half of any positive fraction. The case where is one is Lemma 11.4 of [BauerTaylor], p. 50, and they use the word "approximate half" for such a number (since there may be constructions, for some structures other than the rationals themselves, which rely on such an approximate half but do not require division by two as seen at halfnqq 7211). (Contributed by Jim Kingdon, 25-Nov-2019.) |
Theorem | ltbtwnnqq 7216* | There exists a number between any two positive fractions. Proposition 9-2.6(i) of [Gleason] p. 120. (Contributed by Jim Kingdon, 24-Sep-2019.) |
Theorem | ltbtwnnq 7217* | There exists a number between any two positive fractions. Proposition 9-2.6(i) of [Gleason] p. 120. (Contributed by NM, 17-Mar-1996.) (Revised by Mario Carneiro, 10-May-2013.) |
Theorem | archnqq 7218* | For any fraction, there is an integer that is greater than it. This is also known as the "archimedean property". (Contributed by Jim Kingdon, 1-Dec-2019.) |
Theorem | prarloclemarch 7219* | A version of the Archimedean property. This variation is "stronger" than archnqq 7218 in the sense that we provide an integer which is larger than a given rational even after being multiplied by a second rational . (Contributed by Jim Kingdon, 30-Nov-2019.) |
Theorem | prarloclemarch2 7220* | Like prarloclemarch 7219 but the integer must be at least two, and there is also added to the right hand side. These details follow straightforwardly but are chosen to be helpful in the proof of prarloc 7304. (Contributed by Jim Kingdon, 25-Nov-2019.) |
Theorem | ltrnqg 7221 | Ordering property of reciprocal for positive fractions. For a simplified version of the forward implication, see ltrnqi 7222. (Contributed by Jim Kingdon, 29-Dec-2019.) |
Theorem | ltrnqi 7222 | Ordering property of reciprocal for positive fractions. For the converse, see ltrnqg 7221. (Contributed by Jim Kingdon, 24-Sep-2019.) |
Theorem | nnnq 7223 | The canonical embedding of positive integers into positive fractions. (Contributed by Jim Kingdon, 26-Apr-2020.) |
Theorem | ltnnnq 7224 | Ordering of positive integers via or is equivalent. (Contributed by Jim Kingdon, 3-Oct-2020.) |
Definition | df-enq0 7225* | Define equivalence relation for nonnegative fractions. This is a "temporary" set used in the construction of complex numbers, and is intended to be used only by the construction. (Contributed by Jim Kingdon, 2-Nov-2019.) |
~Q0 | ||
Definition | df-nq0 7226 | Define class of nonnegative fractions. This is a "temporary" set used in the construction of complex numbers, and is intended to be used only by the construction. (Contributed by Jim Kingdon, 2-Nov-2019.) |
Q0 ~Q0 | ||
Definition | df-0nq0 7227 | Define nonnegative fraction constant 0. This is a "temporary" set used in the construction of complex numbers, and is intended to be used only by the construction. (Contributed by Jim Kingdon, 5-Nov-2019.) |
0Q0 ~Q0 | ||
Definition | df-plq0 7228* | Define addition on nonnegative fractions. This is a "temporary" set used in the construction of complex numbers, and is intended to be used only by the construction. (Contributed by Jim Kingdon, 2-Nov-2019.) |
+Q0 Q0 Q0 ~Q0 ~Q0 ~Q0 | ||
Definition | df-mq0 7229* | Define multiplication on nonnegative fractions. This is a "temporary" set used in the construction of complex numbers, and is intended to be used only by the construction. (Contributed by Jim Kingdon, 2-Nov-2019.) |
·Q0 Q0 Q0 ~Q0 ~Q0 ~Q0 | ||
Theorem | dfmq0qs 7230* | Multiplication on nonnegative fractions. This definition is similar to df-mq0 7229 but expands Q0 (Contributed by Jim Kingdon, 22-Nov-2019.) |
·Q0 ~Q0 ~Q0 ~Q0 ~Q0 ~Q0 | ||
Theorem | dfplq0qs 7231* | Addition on nonnegative fractions. This definition is similar to df-plq0 7228 but expands Q0 (Contributed by Jim Kingdon, 24-Nov-2019.) |
+Q0 ~Q0 ~Q0 ~Q0 ~Q0 ~Q0 | ||
Theorem | enq0enq 7232 | Equivalence on positive fractions in terms of equivalence on nonnegative fractions. (Contributed by Jim Kingdon, 12-Nov-2019.) |
~Q0 | ||
Theorem | enq0sym 7233 | The equivalence relation for nonnegative fractions is symmetric. Lemma for enq0er 7236. (Contributed by Jim Kingdon, 14-Nov-2019.) |
~Q0 ~Q0 | ||
Theorem | enq0ref 7234 | The equivalence relation for nonnegative fractions is reflexive. Lemma for enq0er 7236. (Contributed by Jim Kingdon, 14-Nov-2019.) |
~Q0 | ||
Theorem | enq0tr 7235 | The equivalence relation for nonnegative fractions is transitive. Lemma for enq0er 7236. (Contributed by Jim Kingdon, 14-Nov-2019.) |
~Q0 ~Q0 ~Q0 | ||
Theorem | enq0er 7236 | The equivalence relation for nonnegative fractions is an equivalence relation. (Contributed by Jim Kingdon, 12-Nov-2019.) |
~Q0 | ||
Theorem | enq0breq 7237 | Equivalence relation for nonnegative fractions in terms of natural numbers. (Contributed by NM, 27-Aug-1995.) |
~Q0 | ||
Theorem | enq0eceq 7238 | Equivalence class equality of nonnegative fractions in terms of natural numbers. (Contributed by Jim Kingdon, 24-Nov-2019.) |
~Q0 ~Q0 | ||
Theorem | nqnq0pi 7239 | A nonnegative fraction is a positive fraction if its numerator and denominator are positive integers. (Contributed by Jim Kingdon, 10-Nov-2019.) |
~Q0 | ||
Theorem | enq0ex 7240 | The equivalence relation for positive fractions exists. (Contributed by Jim Kingdon, 18-Nov-2019.) |
~Q0 | ||
Theorem | nq0ex 7241 | The class of positive fractions exists. (Contributed by Jim Kingdon, 18-Nov-2019.) |
Q0 | ||
Theorem | nqnq0 7242 | A positive fraction is a nonnegative fraction. (Contributed by Jim Kingdon, 18-Nov-2019.) |
Q0 | ||
Theorem | nq0nn 7243* | Decomposition of a nonnegative fraction into numerator and denominator. (Contributed by Jim Kingdon, 24-Nov-2019.) |
Q0 ~Q0 | ||
Theorem | addcmpblnq0 7244 | Lemma showing compatibility of addition on nonnegative fractions. (Contributed by Jim Kingdon, 23-Nov-2019.) |
~Q0 | ||
Theorem | mulcmpblnq0 7245 | Lemma showing compatibility of multiplication on nonnegative fractions. (Contributed by Jim Kingdon, 20-Nov-2019.) |
~Q0 | ||
Theorem | mulcanenq0ec 7246 | Lemma for distributive law: cancellation of common factor. (Contributed by Jim Kingdon, 29-Nov-2019.) |
~Q0 ~Q0 | ||
Theorem | nnnq0lem1 7247* | Decomposing nonnegative fractions into natural numbers. Lemma for addnnnq0 7250 and mulnnnq0 7251. (Contributed by Jim Kingdon, 23-Nov-2019.) |
~Q0 ~Q0 ~Q0 ~Q0 ~Q0 ~Q0 ~Q0 ~Q0 | ||
Theorem | addnq0mo 7248* | There is at most one result from adding nonnegative fractions. (Contributed by Jim Kingdon, 23-Nov-2019.) |
~Q0 ~Q0 ~Q0 ~Q0 ~Q0 | ||
Theorem | mulnq0mo 7249* | There is at most one result from multiplying nonnegative fractions. (Contributed by Jim Kingdon, 20-Nov-2019.) |
~Q0 ~Q0 ~Q0 ~Q0 ~Q0 | ||
Theorem | addnnnq0 7250 | Addition of nonnegative fractions in terms of natural numbers. (Contributed by Jim Kingdon, 22-Nov-2019.) |
~Q0 +Q0 ~Q0 ~Q0 | ||
Theorem | mulnnnq0 7251 | Multiplication of nonnegative fractions in terms of natural numbers. (Contributed by Jim Kingdon, 19-Nov-2019.) |
~Q0 ·Q0 ~Q0 ~Q0 | ||
Theorem | addclnq0 7252 | Closure of addition on nonnegative fractions. (Contributed by Jim Kingdon, 29-Nov-2019.) |
Q0 Q0 +Q0 Q0 | ||
Theorem | mulclnq0 7253 | Closure of multiplication on nonnegative fractions. (Contributed by Jim Kingdon, 30-Nov-2019.) |
Q0 Q0 ·Q0 Q0 | ||
Theorem | nqpnq0nq 7254 | A positive fraction plus a nonnegative fraction is a positive fraction. (Contributed by Jim Kingdon, 30-Nov-2019.) |
Q0 +Q0 | ||
Theorem | nqnq0a 7255 | Addition of positive fractions is equal with or +Q0. (Contributed by Jim Kingdon, 10-Nov-2019.) |
+Q0 | ||
Theorem | nqnq0m 7256 | Multiplication of positive fractions is equal with or ·Q0. (Contributed by Jim Kingdon, 10-Nov-2019.) |
·Q0 | ||
Theorem | nq0m0r 7257 | Multiplication with zero for nonnegative fractions. (Contributed by Jim Kingdon, 5-Nov-2019.) |
Q0 0Q0 ·Q0 0Q0 | ||
Theorem | nq0a0 7258 | Addition with zero for nonnegative fractions. (Contributed by Jim Kingdon, 5-Nov-2019.) |
Q0 +Q0 0Q0 | ||
Theorem | nnanq0 7259 | Addition of nonnegative fractions with a common denominator. You can add two fractions with the same denominator by adding their numerators and keeping the same denominator. (Contributed by Jim Kingdon, 1-Dec-2019.) |
~Q0 ~Q0 +Q0 ~Q0 | ||
Theorem | distrnq0 7260 | Multiplication of nonnegative fractions is distributive. (Contributed by Jim Kingdon, 27-Nov-2019.) |
Q0 Q0 Q0 ·Q0 +Q0 ·Q0 +Q0 ·Q0 | ||
Theorem | mulcomnq0 7261 | Multiplication of nonnegative fractions is commutative. (Contributed by Jim Kingdon, 27-Nov-2019.) |
Q0 Q0 ·Q0 ·Q0 | ||
Theorem | addassnq0lemcl 7262 | A natural number closure law. Lemma for addassnq0 7263. (Contributed by Jim Kingdon, 3-Dec-2019.) |
Theorem | addassnq0 7263 | Addition of nonnegative fractions is associative. (Contributed by Jim Kingdon, 29-Nov-2019.) |
Q0 Q0 Q0 +Q0 +Q0 +Q0 +Q0 | ||
Theorem | distnq0r 7264 | Multiplication of nonnegative fractions is distributive. Version of distrnq0 7260 with the multiplications commuted. (Contributed by Jim Kingdon, 29-Nov-2019.) |
Q0 Q0 Q0 +Q0 ·Q0 ·Q0 +Q0 ·Q0 | ||
Theorem | addpinq1 7265 | Addition of one to the numerator of a fraction whose denominator is one. (Contributed by Jim Kingdon, 26-Apr-2020.) |
Theorem | nq02m 7266 | Multiply a nonnegative fraction by two. (Contributed by Jim Kingdon, 29-Nov-2019.) |
Q0 ~Q0 ·Q0 +Q0 | ||
Definition | df-inp 7267* |
Define the set of positive reals. A "Dedekind cut" is a partition of
the positive rational numbers into two classes such that all the numbers
of one class are less than all the numbers of the other.
Here we follow the definition of a Dedekind cut from Definition 11.2.1 of [HoTT], p. (varies) with the one exception that we define it over positive rational numbers rather than all rational numbers. A Dedekind cut is an ordered pair of a lower set and an upper set which is inhabited ( ), rounded ( and likewise for ), disjoint ( ) and located ( ). See HoTT for more discussion of those terms and different ways of defining Dedekind cuts. (Note: This is a "temporary" definition used in the construction of complex numbers, and is intended to be used only by the construction.) (Contributed by Jim Kingdon, 25-Sep-2019.) |
Definition | df-i1p 7268* | Define the positive real constant 1. This is a "temporary" set used in the construction of complex numbers and is intended to be used only by the construction. (Contributed by Jim Kingdon, 25-Sep-2019.) |
Definition | df-iplp 7269* |
Define addition on positive reals. From Section 11.2.1 of [HoTT], p.
(varies). We write this definition to closely resemble the definition
in HoTT although some of the conditions are redundant (for example,
implies ) and can be simplified
as
shown at genpdf 7309.
This is a "temporary" set used in the construction of complex numbers, and is intended to be used only by the construction. (Contributed by Jim Kingdon, 26-Sep-2019.) |
Definition | df-imp 7270* |
Define multiplication on positive reals. Here we use a simple
definition which is similar to df-iplp 7269 or the definition of
multiplication on positive reals in Metamath Proof Explorer. This is as
opposed to the more complicated definition of multiplication given in
Section 11.2.1 of [HoTT], p. (varies),
which appears to be motivated by
handling negative numbers or handling modified Dedekind cuts in which
locatedness is omitted.
This is a "temporary" set used in the construction of complex numbers, and is intended to be used only by the construction. (Contributed by Jim Kingdon, 29-Sep-2019.) |
Definition | df-iltp 7271* |
Define ordering on positive reals. We define
if there is a
positive fraction which is an element of the upper cut of
and the lower cut of . From the definition of < in Section 11.2.1
of [HoTT], p. (varies).
This is a "temporary" set used in the construction of complex numbers, and is intended to be used only by the construction. (Contributed by Jim Kingdon, 29-Sep-2019.) |
Theorem | npsspw 7272 | Lemma for proving existence of reals. (Contributed by Jim Kingdon, 27-Sep-2019.) |
Theorem | preqlu 7273 | Two reals are equal if and only if their lower and upper cuts are. (Contributed by Jim Kingdon, 11-Dec-2019.) |
Theorem | npex 7274 | The class of positive reals is a set. (Contributed by NM, 31-Oct-1995.) |
Theorem | elinp 7275* | Membership in positive reals. (Contributed by Jim Kingdon, 27-Sep-2019.) |
Theorem | prop 7276 | A positive real is an ordered pair of a lower cut and an upper cut. (Contributed by Jim Kingdon, 27-Sep-2019.) |
Theorem | elnp1st2nd 7277* | Membership in positive reals, using and to refer to the lower and upper cut. (Contributed by Jim Kingdon, 3-Oct-2019.) |
Theorem | prml 7278* | A positive real's lower cut is inhabited. (Contributed by Jim Kingdon, 27-Sep-2019.) |
Theorem | prmu 7279* | A positive real's upper cut is inhabited. (Contributed by Jim Kingdon, 27-Sep-2019.) |
Theorem | prssnql 7280 | The lower cut of a positive real is a subset of the positive fractions. (Contributed by Jim Kingdon, 28-Sep-2019.) |
Theorem | prssnqu 7281 | The upper cut of a positive real is a subset of the positive fractions. (Contributed by Jim Kingdon, 28-Sep-2019.) |
Theorem | elprnql 7282 | An element of a positive real's lower cut is a positive fraction. (Contributed by Jim Kingdon, 28-Sep-2019.) |
Theorem | elprnqu 7283 | An element of a positive real's upper cut is a positive fraction. (Contributed by Jim Kingdon, 28-Sep-2019.) |
Theorem | 0npr 7284 | The empty set is not a positive real. (Contributed by NM, 15-Nov-1995.) |
Theorem | prcdnql 7285 | A lower cut is closed downwards under the positive fractions. (Contributed by Jim Kingdon, 28-Sep-2019.) |
Theorem | prcunqu 7286 | An upper cut is closed upwards under the positive fractions. (Contributed by Jim Kingdon, 25-Nov-2019.) |
Theorem | prubl 7287 | A positive fraction not in a lower cut is an upper bound. (Contributed by Jim Kingdon, 29-Sep-2019.) |
Theorem | prltlu 7288 | An element of a lower cut is less than an element of the corresponding upper cut. (Contributed by Jim Kingdon, 15-Oct-2019.) |
Theorem | prnmaxl 7289* | A lower cut has no largest member. (Contributed by Jim Kingdon, 29-Sep-2019.) |
Theorem | prnminu 7290* | An upper cut has no smallest member. (Contributed by Jim Kingdon, 7-Nov-2019.) |
Theorem | prnmaddl 7291* | A lower cut has no largest member. Addition version. (Contributed by Jim Kingdon, 29-Sep-2019.) |
Theorem | prloc 7292 | A Dedekind cut is located. (Contributed by Jim Kingdon, 23-Oct-2019.) |
Theorem | prdisj 7293 | A Dedekind cut is disjoint. (Contributed by Jim Kingdon, 15-Dec-2019.) |
Theorem | prarloclemlt 7294 | Two possible ways of contracting an interval which straddles a Dedekind cut. Lemma for prarloc 7304. (Contributed by Jim Kingdon, 10-Nov-2019.) |
Theorem | prarloclemlo 7295* | Contracting the lower side of an interval which straddles a Dedekind cut. Lemma for prarloc 7304. (Contributed by Jim Kingdon, 10-Nov-2019.) |
+Q0 ~Q0 ·Q0 +Q0 ~Q0 ·Q0 | ||
Theorem | prarloclemup 7296 | Contracting the upper side of an interval which straddles a Dedekind cut. Lemma for prarloc 7304. (Contributed by Jim Kingdon, 10-Nov-2019.) |
+Q0 ~Q0 ·Q0 +Q0 ~Q0 ·Q0 | ||
Theorem | prarloclem3step 7297* | Induction step for prarloclem3 7298. (Contributed by Jim Kingdon, 9-Nov-2019.) |
+Q0 ~Q0 ·Q0 +Q0 ~Q0 ·Q0 | ||
Theorem | prarloclem3 7298* | Contracting an interval which straddles a Dedekind cut. Lemma for prarloc 7304. (Contributed by Jim Kingdon, 27-Oct-2019.) |
+Q0 ~Q0 ·Q0 +Q0 ~Q0 ·Q0 | ||
Theorem | prarloclem4 7299* | A slight rearrangement of prarloclem3 7298. Lemma for prarloc 7304. (Contributed by Jim Kingdon, 4-Nov-2019.) |
+Q0 ~Q0 ·Q0 +Q0 ~Q0 ·Q0 | ||
Theorem | prarloclemn 7300* | Subtracting two from a positive integer. Lemma for prarloc 7304. (Contributed by Jim Kingdon, 5-Nov-2019.) |
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