ActivityPub Viewer

A small tool to view real-world ActivityPub objects as JSON! Enter a URL or username from Mastodon or a similar service below, and we'll send a request with the right Accept header to the server to view the underlying object.

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{ "@context": [ "https://www.w3.org/ns/activitystreams", { "ostatus": "http://ostatus.org#", "atomUri": "ostatus:atomUri", "inReplyToAtomUri": "ostatus:inReplyToAtomUri", "conversation": "ostatus:conversation", "sensitive": "as:sensitive", "toot": "http://joinmastodon.org/ns#", "votersCount": "toot:votersCount" } ], "id": "https://mathstodon.xyz/users/MartinEscardo/statuses/114325373550321845", "type": "Note", "summary": null, "inReplyTo": "https://mathstodon.xyz/users/MartinEscardo/statuses/111874742744054699", "published": "2025-04-12T14:05:59Z", "url": "https://mathstodon.xyz/@MartinEscardo/114325373550321845", "attributedTo": "https://mathstodon.xyz/users/MartinEscardo", "to": [ "https://www.w3.org/ns/activitystreams#Public" ], "cc": [ "https://mathstodon.xyz/users/MartinEscardo/followers", "https://mathstodon.xyz/users/ecavallo", "https://types.pl/users/ncf" ], "sensitive": false, "atomUri": "https://mathstodon.xyz/users/MartinEscardo/statuses/114325373550321845", "inReplyToAtomUri": "https://mathstodon.xyz/users/MartinEscardo/statuses/111874742744054699", "conversation": "tag:mathstodon.xyz,2023-08-14:objectId=61683218:objectType=Conversation", "content": "<p>* 2025/04/12. A universal characterization of the closed Euclidean interval.<br /><a href=\"https://mathstodon.xyz/deck/@MartinEscardo/114325340007735876\" target=\"_blank\" rel=\"nofollow noopener noreferrer\" translate=\"no\"><span class=\"invisible\">https://</span><span class=\"ellipsis\">mathstodon.xyz/deck/@MartinEsc</span><span class=\"invisible\">ardo/114325340007735876</span></a></p><p>*2025/05/14. Computing all optimal plays of a sequential game.<br /><a href=\"https://mathstodon.xyz/deck/@MartinEscardo/114506199078361520\" target=\"_blank\" rel=\"nofollow noopener noreferrer\" translate=\"no\"><span class=\"invisible\">https://</span><span class=\"ellipsis\">mathstodon.xyz/deck/@MartinEsc</span><span class=\"invisible\">ardo/114506199078361520</span></a></p><p>*2025/05/20. Internal effectful forcing.<br /><a href=\"https://mathstodon.xyz/deck/@MartinEscardo/114541967632998444\" target=\"_blank\" rel=\"nofollow noopener noreferrer\" translate=\"no\"><span class=\"invisible\">https://</span><span class=\"ellipsis\">mathstodon.xyz/deck/@MartinEsc</span><span class=\"invisible\">ardo/114541967632998444</span></a></p><p>*2025/05/21. A positive way of saying that a type is different from the unit type, in connection with the lifting monad.<br /><a href=\"https://mathstodon.xyz/deck/@MartinEscardo/114547664640960020\" target=\"_blank\" rel=\"nofollow noopener noreferrer\" translate=\"no\"><span class=\"invisible\">https://</span><span class=\"ellipsis\">mathstodon.xyz/deck/@MartinEsc</span><span class=\"invisible\">ardo/114547664640960020</span></a></p><p>*2025/06/05. Taking &quot;algebraically&quot; seriously in the definition of algebraically injective type.<br /><a href=\"https://mathstodon.xyz/deck/@MartinEscardo/114633174055141602\" target=\"_blank\" rel=\"nofollow noopener noreferrer\" translate=\"no\"><span class=\"invisible\">https://</span><span class=\"ellipsis\">mathstodon.xyz/deck/@MartinEsc</span><span class=\"invisible\">ardo/114633174055141602</span></a></p><p>*2025/06/20. The fundamental lemma of transport along equivalences.<br /><a href=\"https://mathstodon.xyz/deck/@MartinEscardo/114717657709706036\" target=\"_blank\" rel=\"nofollow noopener noreferrer\" translate=\"no\"><span class=\"invisible\">https://</span><span class=\"ellipsis\">mathstodon.xyz/deck/@MartinEsc</span><span class=\"invisible\">ardo/114717657709706036</span></a></p><p>*2025/06/22. Question about object classifiers and univalence.<br /><a href=\"https://mathstodon.xyz/deck/@MartinEscardo/114722727504214914\" target=\"_blank\" rel=\"nofollow noopener noreferrer\" translate=\"no\"><span class=\"invisible\">https://</span><span class=\"ellipsis\">mathstodon.xyz/deck/@MartinEsc</span><span class=\"invisible\">ardo/114722727504214914</span></a></p><p>*2025/06/26. Dependent equality in dependent type theory.<br /><a href=\"https://mathstodon.xyz/deck/@MartinEscardo/114751426538568913\" target=\"_blank\" rel=\"nofollow noopener noreferrer\" translate=\"no\"><span class=\"invisible\">https://</span><span class=\"ellipsis\">mathstodon.xyz/deck/@MartinEsc</span><span class=\"invisible\">ardo/114751426538568913</span></a></p><p>*2025/07/01. A proof that the type of natural numbers is a set in MLTT without universes by Evan Cavallo. <br /><a href=\"https://mathstodon.xyz/deck/@ncf@types.pl/114779291804001070\" target=\"_blank\" rel=\"nofollow noopener noreferrer\" translate=\"no\"><span class=\"invisible\">https://</span><span class=\"ellipsis\">mathstodon.xyz/deck/@ncf@types</span><span class=\"invisible\">.pl/114779291804001070</span></a></p><p>The above is a thread started by <span class=\"h-card\" translate=\"no\"><a href=\"https://types.pl/@ncf\" class=\"u-url mention\">@<span>ncf</span></a></span> with that question, and eventually answered by <span class=\"h-card\" translate=\"no\"><a href=\"https://mathstodon.xyz/@ecavallo\" class=\"u-url mention\">@<span>ecavallo</span></a></span> . I made wrong statements in that thread, but I am keeping them without correction (people corrected me there).</p><p>4/</p>", "contentMap": { "en": "<p>* 2025/04/12. A universal characterization of the closed Euclidean interval.<br /><a href=\"https://mathstodon.xyz/deck/@MartinEscardo/114325340007735876\" target=\"_blank\" rel=\"nofollow noopener noreferrer\" translate=\"no\"><span class=\"invisible\">https://</span><span class=\"ellipsis\">mathstodon.xyz/deck/@MartinEsc</span><span class=\"invisible\">ardo/114325340007735876</span></a></p><p>*2025/05/14. Computing all optimal plays of a sequential game.<br /><a href=\"https://mathstodon.xyz/deck/@MartinEscardo/114506199078361520\" target=\"_blank\" rel=\"nofollow noopener noreferrer\" translate=\"no\"><span class=\"invisible\">https://</span><span class=\"ellipsis\">mathstodon.xyz/deck/@MartinEsc</span><span class=\"invisible\">ardo/114506199078361520</span></a></p><p>*2025/05/20. Internal effectful forcing.<br /><a href=\"https://mathstodon.xyz/deck/@MartinEscardo/114541967632998444\" target=\"_blank\" rel=\"nofollow noopener noreferrer\" translate=\"no\"><span class=\"invisible\">https://</span><span class=\"ellipsis\">mathstodon.xyz/deck/@MartinEsc</span><span class=\"invisible\">ardo/114541967632998444</span></a></p><p>*2025/05/21. A positive way of saying that a type is different from the unit type, in connection with the lifting monad.<br /><a href=\"https://mathstodon.xyz/deck/@MartinEscardo/114547664640960020\" target=\"_blank\" rel=\"nofollow noopener noreferrer\" translate=\"no\"><span class=\"invisible\">https://</span><span class=\"ellipsis\">mathstodon.xyz/deck/@MartinEsc</span><span class=\"invisible\">ardo/114547664640960020</span></a></p><p>*2025/06/05. Taking &quot;algebraically&quot; seriously in the definition of algebraically injective type.<br /><a href=\"https://mathstodon.xyz/deck/@MartinEscardo/114633174055141602\" target=\"_blank\" rel=\"nofollow noopener noreferrer\" translate=\"no\"><span class=\"invisible\">https://</span><span class=\"ellipsis\">mathstodon.xyz/deck/@MartinEsc</span><span class=\"invisible\">ardo/114633174055141602</span></a></p><p>*2025/06/20. The fundamental lemma of transport along equivalences.<br /><a href=\"https://mathstodon.xyz/deck/@MartinEscardo/114717657709706036\" target=\"_blank\" rel=\"nofollow noopener noreferrer\" translate=\"no\"><span class=\"invisible\">https://</span><span class=\"ellipsis\">mathstodon.xyz/deck/@MartinEsc</span><span class=\"invisible\">ardo/114717657709706036</span></a></p><p>*2025/06/22. Question about object classifiers and univalence.<br /><a href=\"https://mathstodon.xyz/deck/@MartinEscardo/114722727504214914\" target=\"_blank\" rel=\"nofollow noopener noreferrer\" translate=\"no\"><span class=\"invisible\">https://</span><span class=\"ellipsis\">mathstodon.xyz/deck/@MartinEsc</span><span class=\"invisible\">ardo/114722727504214914</span></a></p><p>*2025/06/26. Dependent equality in dependent type theory.<br /><a href=\"https://mathstodon.xyz/deck/@MartinEscardo/114751426538568913\" target=\"_blank\" rel=\"nofollow noopener noreferrer\" translate=\"no\"><span class=\"invisible\">https://</span><span class=\"ellipsis\">mathstodon.xyz/deck/@MartinEsc</span><span class=\"invisible\">ardo/114751426538568913</span></a></p><p>*2025/07/01. A proof that the type of natural numbers is a set in MLTT without universes by Evan Cavallo. <br /><a href=\"https://mathstodon.xyz/deck/@ncf@types.pl/114779291804001070\" target=\"_blank\" rel=\"nofollow noopener noreferrer\" translate=\"no\"><span class=\"invisible\">https://</span><span class=\"ellipsis\">mathstodon.xyz/deck/@ncf@types</span><span class=\"invisible\">.pl/114779291804001070</span></a></p><p>The above is a thread started by <span class=\"h-card\" translate=\"no\"><a href=\"https://types.pl/@ncf\" class=\"u-url mention\">@<span>ncf</span></a></span> with that question, and eventually answered by <span class=\"h-card\" translate=\"no\"><a href=\"https://mathstodon.xyz/@ecavallo\" class=\"u-url mention\">@<span>ecavallo</span></a></span> . I made wrong statements in that thread, but I am keeping them without correction (people corrected me there).</p><p>4/</p>" }, "updated": "2025-07-02T19:05:13Z", "attachment": [], "tag": [ { "type": "Mention", "href": "https://types.pl/users/ncf", "name": "@ncf@types.pl" }, { "type": "Mention", "href": "https://mathstodon.xyz/users/ecavallo", "name": "@ecavallo" } ], "replies": { "id": "https://mathstodon.xyz/users/MartinEscardo/statuses/114325373550321845/replies", "type": "Collection", "first": { "type": "CollectionPage", "next": "https://mathstodon.xyz/users/MartinEscardo/statuses/114325373550321845/replies?only_other_accounts=true&page=true", "partOf": "https://mathstodon.xyz/users/MartinEscardo/statuses/114325373550321845/replies", "items": [] } }, "likes": { "id": "https://mathstodon.xyz/users/MartinEscardo/statuses/114325373550321845/likes", "type": "Collection", "totalItems": 1 }, "shares": { "id": "https://mathstodon.xyz/users/MartinEscardo/statuses/114325373550321845/shares", "type": "Collection", "totalItems": 1 } }