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| Description: Extend wff definition to
include proper substitution (read "the wff that
results when (Instead of introducing wsb 1208 as an axiomatic statement, as was done in an older version of this database, we introduce it by "proving" a special case of set theory's more general wsbc 1207. This lets us avoid overloading its connectives, thus preventing ambiguity that would complicate some Metamath parsers. Note: To see the proof steps of this syntax proof, type "show proof wsb /all" in the Metamath program.) |
| Ref | Expression |
|---|---|
| wsb |
|
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | wsbc 1207 |
1
|
| Colors of variables: wff set class |
| Syntax hints: |
| This theorem is referenced by: sbimi 1210 sbbii 1211 drsb1 1212 sb1 1213 sb2 1214 sbequ1 1215 sbequ2 1216 stdpc7 1217 sbequ12 1218 sbequ12r 1219 sbequ12a 1220 sbid 1221 stdpc4 1222 sbf 1223 sb6x 1225 hbs1f 1226 sbt 1229 equsb1 1230 equsb2 1231 sbied 1232 sbie 1233 sb4a 1236 sb6f 1238 sb5f 1239 sb4e 1240 hbsb2a 1241 hbsb2e 1242 hbsb3 1243 ax16 1246 sb3 1259 sb4 1260 sb4b 1261 dfsb2 1262 dfsb3 1263 hbsb2 1264 sbequi 1265 sbequ 1266 drsb2 1267 sbn 1268 sbi1 1269 sbi2 1270 sbim 1271 sbor 1272 sb19.21 1273 sban 1274 sb3an 1275 sbbi 1276 sblbis 1277 sbrbis 1278 sbrbif 1279 a4sbe 1280 a4sbim 1281 a4sbbi 1282 sbbid 1283 sbequ8 1284 sbf3t 1285 hbsb4 1286 hbsb4t 1287 dvelimf 1288 dvelimdf 1289 sbco 1290 sbid2 1291 sbidm 1292 sbco2 1293 sbco2d 1294 sbco3 1295 sbcom 1296 sb5rf 1297 sb6rf 1298 sb8 1299 sb8e 1300 sb9i 1301 sb9 1302 sb6 1305 sb5 1306 ax16ALT 1309 sbhb 1367 equsb3lem 1368 equsb3 1369 elsb3 1370 hbs1 1371 hbsb 1372 sbcom2 1373 2sb5 1374 2sb6 1375 sb6a 1376 2sb5rf 1377 2sb6rf 1378 dfsb7 1379 sb7f 1380 sb10f 1381 sbelx 1383 sbel2x 1384 sbal1 1385 sbal 1386 sbex 1387 sbalv 1388 exsb 1389 sbal2 1397 sb8eu 1429 cbveu 1430 eu1 1431 mo 1432 euex 1433 eu2 1435 eu3 1436 mo3 1440 mo4f 1441 mopick 1472 2mo 1487 2mos 1488 2eu6 1494 sbc7g 2003 ac6sfilem3 4590 ac6sfi 4591 gapm 11784 indexf 11847 |