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Mirrors > Home > MPE Home > Th. List > Mathboxes > bj-csbsn | Structured version Visualization version GIF version |
Description: Substitution in a singleton. (Contributed by BJ, 6-Oct-2018.) |
Ref | Expression |
---|---|
bj-csbsn | ⊢ ⦋𝐴 / 𝑥⦌{𝑥} = {𝐴} |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | bj-csbsnlem 32898 | . . 3 ⊢ ⦋𝑦 / 𝑥⦌{𝑥} = {𝑦} | |
2 | 1 | csbeq2i 3993 | . 2 ⊢ ⦋𝐴 / 𝑦⦌⦋𝑦 / 𝑥⦌{𝑥} = ⦋𝐴 / 𝑦⦌{𝑦} |
3 | csbco 3543 | . 2 ⊢ ⦋𝐴 / 𝑦⦌⦋𝑦 / 𝑥⦌{𝑥} = ⦋𝐴 / 𝑥⦌{𝑥} | |
4 | bj-csbsnlem 32898 | . 2 ⊢ ⦋𝐴 / 𝑦⦌{𝑦} = {𝐴} | |
5 | 2, 3, 4 | 3eqtr3i 2652 | 1 ⊢ ⦋𝐴 / 𝑥⦌{𝑥} = {𝐴} |
Colors of variables: wff setvar class |
Syntax hints: = wceq 1483 ⦋csb 3533 {csn 4177 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1722 ax-4 1737 ax-5 1839 ax-6 1888 ax-7 1935 ax-9 1999 ax-10 2019 ax-11 2034 ax-12 2047 ax-13 2246 ax-ext 2602 |
This theorem depends on definitions: df-bi 197 df-or 385 df-an 386 df-tru 1486 df-ex 1705 df-nf 1710 df-sb 1881 df-clab 2609 df-cleq 2615 df-clel 2618 df-nfc 2753 df-v 3202 df-sbc 3436 df-csb 3534 df-sn 4178 |
This theorem is referenced by: bj-snsetex 32951 |
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