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| <pre class="alectryon-io highlight"><!-- Generator: Alectryon --><span class="alectryon-sentence"><input class="alectryon-toggle" id="abpullback-v-chk0" style="display: none" type="checkbox"><label class="alectryon-input" for="abpullback-v-chk0"><span class="kn">Require Import</span> Basics.</label><small class="alectryon-output"><div><div class="alectryon-messages"><blockquote class="alectryon-message">[Loading ML file number_string_notation_plugin.cmxs (<span class="nb">using</span> legacy method) ... <span class="bp">done</span>]</blockquote></div></div></small><span class="alectryon-wsp"> | ||
| </span></span><span class="alectryon-sentence"><span class="alectryon-input"><span class="kn">Require Import</span> Limits.Pullback Cubical.PathSquare.</span><span class="alectryon-wsp"> | ||
| </span></span><span class="alectryon-sentence"><span class="alectryon-input"><span class="kn">Require Export</span> Algebra.Groups.GrpPullback.</span><span class="alectryon-wsp"> | ||
| </span></span><span class="alectryon-sentence"><span class="alectryon-input"><span class="kn">Require Import</span> Algebra.AbGroups.AbelianGroup.</span><span class="alectryon-wsp"> | ||
| </span></span><span class="alectryon-sentence"><span class="alectryon-input"><span class="kn">Require Import</span> WildCat.Core.</span><span class="alectryon-wsp"> | ||
| </span></span><span class="alectryon-wsp"> | ||
| <span class="sd">(** * Pullbacks of abelian groups *)</span> | ||
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| </span><span class="alectryon-sentence"><span class="alectryon-input"><span class="kn">Section</span> <span class="nf">AbPullback</span>.</span><span class="alectryon-wsp"> | ||
| </span></span><span class="alectryon-wsp"> <span class="c">(* Variables are named to correspond with Limits.Pullback. *)</span> | ||
| </span><span class="alectryon-wsp"> </span><span class="alectryon-sentence"><span class="alectryon-input"><span class="kn">Context</span> {<span class="nv">A</span> <span class="nv">B</span> <span class="nv">C</span> : AbGroup} (<span class="nv">f</span> : B $-> A) (<span class="nv">g</span> : C $-> A).</span><span class="alectryon-wsp"> | ||
| </span></span><span class="alectryon-wsp"> | ||
| </span><span class="alectryon-wsp"> </span><span class="alectryon-sentence"><input class="alectryon-toggle" id="abpullback-v-chk1" style="display: none" type="checkbox"><label class="alectryon-input" for="abpullback-v-chk1"><span class="kn">Global Instance</span> <span class="nf">ab_pullback_commutative</span> | ||
| : Commutative (@group_sgop (grp_pullback f g)).</label><small class="alectryon-output"><div><div class="alectryon-goals"><blockquote class="alectryon-goal"><div class="goal-hyps"><span><var>A, B, C</var><span class="hyp-type"><b>: </b><span>AbGroup</span></span></span><br><span><var>f</var><span class="hyp-type"><b>: </b><span>B $-> A</span></span></span><br><span><var>g</var><span class="hyp-type"><b>: </b><span>C $-> A</span></span></span><br></div><span class="goal-separator"><hr></span><div class="goal-conclusion">Commutative group_sgop</div></blockquote></div></div></small><span class="alectryon-wsp"> | ||
| </span></span><span class="alectryon-wsp"> </span><span class="alectryon-sentence"><input class="alectryon-toggle" id="abpullback-v-chk2" style="display: none" type="checkbox"><label class="alectryon-input" for="abpullback-v-chk2"><span class="kn">Proof</span>.</label><small class="alectryon-output"><div><div class="alectryon-goals"><blockquote class="alectryon-goal"><div class="goal-hyps"><span><var>A, B, C</var><span class="hyp-type"><b>: </b><span>AbGroup</span></span></span><br><span><var>f</var><span class="hyp-type"><b>: </b><span>B $-> A</span></span></span><br><span><var>g</var><span class="hyp-type"><b>: </b><span>C $-> A</span></span></span><br></div><span class="goal-separator"><hr></span><div class="goal-conclusion">Commutative group_sgop</div></blockquote></div></div></small><span class="alectryon-wsp"> | ||
| </span></span><span class="alectryon-wsp"> </span><span class="alectryon-sentence"><input class="alectryon-toggle" id="abpullback-v-chk3" style="display: none" type="checkbox"><label class="alectryon-input" for="abpullback-v-chk3"><span class="nb">unfold</span> Commutative.</label><small class="alectryon-output"><div><div class="alectryon-goals"><blockquote class="alectryon-goal"><div class="goal-hyps"><span><var>A, B, C</var><span class="hyp-type"><b>: </b><span>AbGroup</span></span></span><br><span><var>f</var><span class="hyp-type"><b>: </b><span>B $-> A</span></span></span><br><span><var>g</var><span class="hyp-type"><b>: </b><span>C $-> A</span></span></span><br></div><span class="goal-separator"><hr></span><div class="goal-conclusion"><span class="kr">forall</span> <span class="nv">x</span> <span class="nv">y</span> : grp_pullback f g, | ||
| group_sgop x y = group_sgop y x</div></blockquote></div></div></small><span class="alectryon-wsp"> | ||
| </span></span><span class="alectryon-wsp"> </span><span class="alectryon-sentence"><input class="alectryon-toggle" id="abpullback-v-chk4" style="display: none" type="checkbox"><label class="alectryon-input" for="abpullback-v-chk4"><span class="nb">intros</span> [b [c p]] [d [e q]].</label><small class="alectryon-output"><div><div class="alectryon-goals"><blockquote class="alectryon-goal"><div class="goal-hyps"><span><var>A, B, C</var><span class="hyp-type"><b>: </b><span>AbGroup</span></span></span><br><span><var>f</var><span class="hyp-type"><b>: </b><span>B $-> A</span></span></span><br><span><var>g</var><span class="hyp-type"><b>: </b><span>C $-> A</span></span></span><br><span><var>b</var><span class="hyp-type"><b>: </b><span>B</span></span></span><br><span><var>c</var><span class="hyp-type"><b>: </b><span>C</span></span></span><br><span><var>p</var><span class="hyp-type"><b>: </b><span>f b = g c</span></span></span><br><span><var>d</var><span class="hyp-type"><b>: </b><span>B</span></span></span><br><span><var>e</var><span class="hyp-type"><b>: </b><span>C</span></span></span><br><span><var>q</var><span class="hyp-type"><b>: </b><span>f d = g e</span></span></span><br></div><span class="goal-separator"><hr></span><div class="goal-conclusion">group_sgop (b; c; p) (d; e; q) = | ||
| group_sgop (d; e; q) (b; c; p)</div></blockquote></div></div></small><span class="alectryon-wsp"> | ||
| </span></span><span class="alectryon-wsp"> </span><span class="alectryon-sentence"><input class="alectryon-toggle" id="abpullback-v-chk5" style="display: none" type="checkbox"><label class="alectryon-input" for="abpullback-v-chk5"><span class="nb">apply</span> equiv_path_pullback; <span class="nb">simpl</span>.</label><small class="alectryon-output"><div><div class="alectryon-goals"><blockquote class="alectryon-goal"><div class="goal-hyps"><span><var>A, B, C</var><span class="hyp-type"><b>: </b><span>AbGroup</span></span></span><br><span><var>f</var><span class="hyp-type"><b>: </b><span>B $-> A</span></span></span><br><span><var>g</var><span class="hyp-type"><b>: </b><span>C $-> A</span></span></span><br><span><var>b</var><span class="hyp-type"><b>: </b><span>B</span></span></span><br><span><var>c</var><span class="hyp-type"><b>: </b><span>C</span></span></span><br><span><var>p</var><span class="hyp-type"><b>: </b><span>f b = g c</span></span></span><br><span><var>d</var><span class="hyp-type"><b>: </b><span>B</span></span></span><br><span><var>e</var><span class="hyp-type"><b>: </b><span>C</span></span></span><br><span><var>q</var><span class="hyp-type"><b>: </b><span>f d = g e</span></span></span><br></div><span class="goal-separator"><hr></span><div class="goal-conclusion">{p0 : sg_op b d = sg_op d b & | ||
| {q0 : sg_op c e = sg_op e c & | ||
| PathSquare (ap f p0) (ap g q0) | ||
| (grp_homo_op_agree f g p q) | ||
| (grp_homo_op_agree f g q p)}}</div></blockquote></div></div></small><span class="alectryon-wsp"> | ||
| </span></span><span class="alectryon-wsp"> </span><span class="alectryon-sentence"><input class="alectryon-toggle" id="abpullback-v-chk6" style="display: none" type="checkbox"><label class="alectryon-input" for="abpullback-v-chk6"><span class="nb">refine</span> (commutativity _ _; commutativity _ _; _).</label><small class="alectryon-output"><div><div class="alectryon-goals"><blockquote class="alectryon-goal"><div class="goal-hyps"><span><var>A, B, C</var><span class="hyp-type"><b>: </b><span>AbGroup</span></span></span><br><span><var>f</var><span class="hyp-type"><b>: </b><span>B $-> A</span></span></span><br><span><var>g</var><span class="hyp-type"><b>: </b><span>C $-> A</span></span></span><br><span><var>b</var><span class="hyp-type"><b>: </b><span>B</span></span></span><br><span><var>c</var><span class="hyp-type"><b>: </b><span>C</span></span></span><br><span><var>p</var><span class="hyp-type"><b>: </b><span>f b = g c</span></span></span><br><span><var>d</var><span class="hyp-type"><b>: </b><span>B</span></span></span><br><span><var>e</var><span class="hyp-type"><b>: </b><span>C</span></span></span><br><span><var>q</var><span class="hyp-type"><b>: </b><span>f d = g e</span></span></span><br></div><span class="goal-separator"><hr></span><div class="goal-conclusion">PathSquare (ap f (commutativity b d)) | ||
| (ap g (commutativity c e)) | ||
| (grp_homo_op_agree f g p q) | ||
| (grp_homo_op_agree f g q p)</div></blockquote></div></div></small><span class="alectryon-wsp"> | ||
| </span></span><span class="alectryon-wsp"> </span><span class="alectryon-sentence"><input class="alectryon-toggle" id="abpullback-v-chk7" style="display: none" type="checkbox"><label class="alectryon-input" for="abpullback-v-chk7"><span class="nb">apply</span> equiv_sq_path.</label><small class="alectryon-output"><div><div class="alectryon-goals"><blockquote class="alectryon-goal"><div class="goal-hyps"><span><var>A, B, C</var><span class="hyp-type"><b>: </b><span>AbGroup</span></span></span><br><span><var>f</var><span class="hyp-type"><b>: </b><span>B $-> A</span></span></span><br><span><var>g</var><span class="hyp-type"><b>: </b><span>C $-> A</span></span></span><br><span><var>b</var><span class="hyp-type"><b>: </b><span>B</span></span></span><br><span><var>c</var><span class="hyp-type"><b>: </b><span>C</span></span></span><br><span><var>p</var><span class="hyp-type"><b>: </b><span>f b = g c</span></span></span><br><span><var>d</var><span class="hyp-type"><b>: </b><span>B</span></span></span><br><span><var>e</var><span class="hyp-type"><b>: </b><span>C</span></span></span><br><span><var>q</var><span class="hyp-type"><b>: </b><span>f d = g e</span></span></span><br></div><span class="goal-separator"><hr></span><div class="goal-conclusion">ap f (commutativity b d) @ grp_homo_op_agree f g q p = | ||
| grp_homo_op_agree f g p q @ ap g (commutativity c e)</div></blockquote></div></div></small><span class="alectryon-wsp"> | ||
| </span></span><span class="alectryon-wsp"> </span><span class="alectryon-sentence"><span class="alectryon-input"><span class="nb">apply</span> path_ishprop.</span><span class="alectryon-wsp"> | ||
| </span></span><span class="alectryon-wsp"> </span><span class="alectryon-sentence"><span class="alectryon-input"><span class="kn">Defined</span>.</span><span class="alectryon-wsp"> | ||
| </span></span><span class="alectryon-wsp"> | ||
| </span><span class="alectryon-wsp"> </span><span class="alectryon-sentence"><span class="alectryon-input"><span class="kn">Global Instance</span> <span class="nf">isabgroup_ab_pullback</span> | ||
| : IsAbGroup (grp_pullback f g) := {}.</span><span class="alectryon-wsp"> | ||
| </span></span><span class="alectryon-wsp"> | ||
| </span><span class="alectryon-wsp"> </span><span class="alectryon-sentence"><span class="alectryon-input"><span class="kn">Definition</span> <span class="nf">ab_pullback</span> | ||
| : AbGroup := Build_AbGroup (grp_pullback f g) _.</span><span class="alectryon-wsp"> | ||
| </span></span><span class="alectryon-wsp"> | ||
| <span class="sd">(** The corecursion principle is inherited from Groups; use grp_pullback_corec and friends from Groups/GrpPullback.v. *)</span> | ||
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| </span><span class="alectryon-sentence"><span class="alectryon-input"><span class="kn">End</span> <span class="nf">AbPullback</span>.</span></span></pre> | ||
| </div> | ||
| </div></body> | ||
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