Flows on Classes of Regular Semigroups and Cauchy Categories

<p>(a) An arrow in <span class="nowrap"><svg height="12.7178pt" id="M429" style="vertical-align:-3.42947pt" version="1.1" viewbox="-0.0498162 -9.28833 21.5126 12.7178" width="21.5126pt" xmlns="http://www.w3.org/2000/svg"><g transform="matrix(.013,0,0,-0.013,0,0)"><path d="M449 290C449 369 411 446 324 446C271 446 212 414 173 378C76 289 55 151 55 19C55 -41 73 -100 116 -142C162 -187 228 -202 291 -217C320 -224 348 -238 371 -257C376 -227 375 -219 362 -192C349 -168 330 -145 280 -137C228 -128 179 -110 134 -82C100 -61 96 -17 96 24C121 1 154 -12 188 -12C213 -12 256 1 298 24C374 64 449 162 449 290ZM367 278C366 125 292 56 262 40C244 31 227 27 212 27C172 27 134 50 135 87C142 261 201 360 246 390C260 400 278 403 292 403C340 403 367 348 367 278Z"></path></g><g transform="matrix(.013,0,0,-0.013,6.202,0)"><path d="M300 -147C201 -63 143 98 143 270S200 602 300 686L282 710C136 610 70 450 70 271V270C70 89 136 -72 282 -170L300 -147Z"></path></g><g transform="matrix(.013,0,0,-0.013,10.7,0)"><path d="M449 634C442 637 425 643 405 650C376 660 341 666 307 666C181 666 98 590 98 485C98 400 170 343 215 310L246 288C307 243 343 204 343 147C343 67 291 18 219 18C104 18 61 124 51 202L23 199C28 124 27 71 27 47C47 22 122 -16 204 -16C324 -16 428 60 428 174C428 256 379 309 307 360L276 382C223 419 179 455 179 516C179 576 221 632 293 632C379 632 410 564 418 487L448 490C446 536 446 592 449 634Z"></path></g><g transform="matrix(.013,0,0,-0.013,16.836,0)"><path d="M275 270C275 450 212 609 64 710L45 686C145 604 203 442 203 270S147 -63 45 -147L64 -170C213 -68 275 89 275 270Z"></path></g></svg>.</span> (b) Composition of arrows in <span class="nowrap"><svg height="12.7178pt" id="M430" style="vertical-align:-3.42947pt" version="1.1" viewbox="-0.0498162 -9.28833 21.5126 12.7178" width="21.5126pt" xmlns="http://www.w3.org/2000/svg"><g transform="matrix(.013,0,0,-0.013,0,0)"><path d="M449 290C449 369 411 446 324 446C271 446 212 414 173 378C76 289 55 151 55 19C55 -41 73 -100 116 -142C162 -187 228 -202 291 -217C320 -224 348 -238 371 -257C376 -227 375 -219 362 -192C349 -168 330 -145 280 -137C228 -128 179 -110 134 -82C100 -61 96 -17 96 24C121 1 154 -12 188 -12C213 -12 256 1 298 24C374 64 449 162 449 290ZM367 278C366 125 292 56 262 40C244 31 227 27 212 27C172 27 134 50 135 87C142 261 201 360 246 390C260 400 278 403 292 403C340 403 367 348 367 278Z"></path></g><g transform="matrix(.013,0,0,-0.013,6.202,0)"><path d="M300 -147C201 -63 143 98 143 270S200 602 300 686L282 710C136 610 70 450 70 271V270C70 89 136 -72 282 -170L300 -147Z"></path></g><g transform="matrix(.013,0,0,-0.013,10.7,0)"><path d="M449 634C442 637 425 643 405 650C376 660 341 666 307 666C181 666 98 590 98 485C98 400 170 343 215 310L246 288C307 243 343 204 343 147C343 67 291 18 219 18C104 18 61 124 51 202L23 199C28 124 27 71 27 47C47 22 122 -16 204 -16C324 -16 428 60 428 174C428 256 379 309 307 360L276 382C223 419 179 455 179 516C179 576 221 632 293 632C379 632 410 564 418 487L448 490C446 536 446 592 449 634Z"></path></g><g transform="matrix(.013,0,0,-0.013,16.836,0)"><path d="M275 270C275 450 212 609 64 710L45 686C145 604 203 442 203 270S147 -63 45 -147L64 -170C213 -68 275 89 275 270Z"></path></g></svg>.</span> (c) Category with one vertex. (d) Typical arrow in Rees matrix semigroup.</p>

Journal of Mathematics

Flows on Classes of Regular Semigroups and Cauchy Categories

Figure 1