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citations	visibility	version 1	version 1	(static HELM directory)	helena

Informal description: ""

<{( timesfrt ) .​ ( rat )} .​ fixf > .​ λ[x: frac ] .​ λ[y: frac ] .​ λ[z: frac ] .​ λ[u: frac ] .​ λ[v:(y) .​ (x) .​ eq ] .​ λ[w:(u) .​ (z) .​ eq ] .​ {(w) .​ (v) .​ (u) .​ (z) .​ (y) .​ (x)} .​ t20

Validation parameters: sort hierarchy = "Z2", kernel options = ""