Step
*
1
of Lemma
rn-metric_wf
1. n : ℕ
2. λx,y. d(x;y) ∈ ℝ^n ⟶ ℝ^n ⟶ ℝ
3. ∀x,y:ℝ^n. (r0 ≤ d(x;y))
4. x : ℝ^n
5. y : ℝ^n
6. z : ℝ^n
⊢ d(x;z) ≤ (d(x;y) + d(z;y))
BY
{ ((Assert d(z;y) = d(y;z) BY Auto) THEN RWO "-1" 0 THEN Auto) }
Latex:
Latex:
1. n : \mBbbN{}
2. \mlambda{}x,y. d(x;y) \mmember{} \mBbbR{}\^{}n {}\mrightarrow{} \mBbbR{}\^{}n {}\mrightarrow{} \mBbbR{}
3. \mforall{}x,y:\mBbbR{}\^{}n. (r0 \mleq{} d(x;y))
4. x : \mBbbR{}\^{}n
5. y : \mBbbR{}\^{}n
6. z : \mBbbR{}\^{}n
\mvdash{} d(x;z) \mleq{} (d(x;y) + d(z;y))
By
Latex:
((Assert d(z;y) = d(y;z) BY Auto) THEN RWO "-1" 0 THEN Auto)
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